Showing posts with label 7549-7010 Tuna. Show all posts
Showing posts with label 7549-7010 Tuna. Show all posts

Thursday, January 31, 2013

Seiko "Tuna" and summary of Seiko's vintage Shrouded Divers

Having lunch with some new colleagues from Sales, I was wearing the "Tuna" Seiko 300m Professional Shrouded Diver 7549-7010 on its summer bracelet: a stainless steel solid end-link SuperOyster. One of the new colleagues leaned over and asked: "So, is that a Rolex?"



The 7549- 7010 300m Shrouded Diver, this time on a Monster bracelet, trying not to look like a Sub...

Quick as a flash I sized up the situation and said "Rolex!? Nooooo, what we have here is a heavy duty professional, 300m shrouded saturation diver designed and built over a quarter of a century ago by the legendary Ikuo Tokunaga, incorporating a revolutionary helium valve and with the high-torgue movement specially designed for this watch and its heavy duty hands.....see!" and I passed it over for him to see the hands.

For a second he was about to fall for it, when his face brightened and he roared with laughter as he shouted "HA! You almost had me there - it says SEIKO on the dial!!"

I just love WIS moments like that Anyway, here is a summary of Seiko's legendary Professional Shrouded divers:




... with the 7549-7010 as the first 300m professional diver with a quartz movement and protector (shroud) released by Seiko in 1978. Its stainless steel shroud looks like a can of Tuna, hence the nickname "Tuna".

Wednesday, December 12, 2012

Seiko vintage content interview (ahem ;-) on Danish lifestyle blog ...

... which can be seen at http://my-pleasure.dk/2012/10/en-laeser-og-hans-passion-for-vintage-seiko-ure/ (choose "English" or "Engelsk" from the Google Translate drop down box to the right of the interview - please consider clicking some of the "like" buttons to let them know you've been there





Er der noget som en god historie? Næppe. Dagen i dag omhandler en god historie – Harry er glad for Seiko, og i dag gør han os særdeles meget klogere på netop det brand, der også rummer gode historier. Take it away, Harry!

Harry med sin far engang i 70erne. Faderens gamle Altus kan ses på hans arm… og i Harrys samling!


Harald – du er glad for ure, og Seiko i særdeleshed. Hvor stammer interessen fra?

- Min interesse stammer formodentligt fra min opvækst i 60′erne og 70′erne, hvor de fleste mænd gik i habit, og hvor en mands ur spillede en vigtigere rolle, end det gør i dag. Jeg husker især min fars ur, og hvordan det var med til at definere mit billede af ham.


Hvilket ur, var dit første Seiko – og hvor fandt du det?

- Min første Seiko var sjovt nok et af de helt store “grails” indenfor vintage Seiko ure: Seiko’s første dykkeur, cal. 6217 fra 1967, som jeg “fandt” for cirka otte år siden. Allerede som knægt havde jeg set mig lunt på ”seje” dykkerure med drejeskiver, men livet kom lidt i vejen, så det var først omkring min 40 års fødselsdag, at jeg begyndte at sætte mig ind i verdenen af dykkerure. Jeg begyndte at følge lidt med i diverse urfora på internettet, og især Rolex samt Seiko & Citizen fora virkede livligt med mange diskussioner omkring især dykkerure fra 70′erne og 80′erne. Der kom også nogle indslag om Seikos første dykkerur, som allerede dengang blev betragtet som en “grail”, og som også kostede væsentligt mere end de senere modeller – derfor var det ur lige så langt udenfor min rækkevide som, Rolex var.

På dette tidspunkt var min ur-interesse vækket, og en dag bladrede jeg igennem Den Blå Avis, hvor jeg faldt over en gut i Thisted, som samlede lommeure, og som havde nogle ældre armbåndsure, han ville bytte med. Jeg ringede og spurgte, om han eventuelt havde nogle dykkerure. Det mente han ikke, men han endte med at rode nogle skuffer igennem…. og fandt “et Seiko med en delfin på bagkassen”, som jeg kunne genkende som intet mindre end en cal. 6217! Heldigvis havde jeg et Omega lommeur fra 1934, jeg kunne bytte med, og derved blev en passion født! Hele historien kan læses her <–

Seiko’s første dykkerur – kaliber 6217 – i gang med en restauration.



Hvad rummer din ursamling i dag – Seiko såvel som andre brands?

- Jeg forsøger at holde et tema i samlingen, så det er kun Seiko, primært fra 1964 (mit fødselsår – på et eller andet måde er man da nødt til at begrænse sig) … og så min fars Altus fra 60′erne, som han købte lige omkring jeg blev født, og som dengang var indbegrebet af “at være voksen” igennem hele min barndom. Han mente selv – til min store ærgrelse – at have smidt den ud for mange år siden, men fandt den forleden og spurgte, om jeg stadigvæk vil have den… Jeg havde glædeligt byttet hele min samling for at få det ur!


At jeg netop vælger 1964 er – udeover det er mit fødselsår – ikke helt tilfældigt. I 1964 fik Seiko tildelt ansvaret for tidtagningen under Tokyo Olympiaden, og Seiko fik mulighed for at vise, hvad de kunne. Nogle af deres mest spændende, sjældne og innovative ure kommer derfor fra denne periode. Dertil kommer, at Seikos design fra midt i tresserne er sublimt – måske noget af det bedste design, der nogensinde er lavet.


1964 Grand Seiko Chronometer med 1964 Parker blyant.



Samtidigt begynder Seiko at deltage i det prestigefyldte Astronomical Observatory Chronometer Concours i Neuchatel, og i 1968 er Seiko ved at “rydde bordet”. For mig kulminere det hele i Grand Seiko kaliber 43999 med kronometer certificering i 1964 – i mine øjne det smukkeste Seiko har præsteret i det mekaniske urs mest spændende årti. Jeg har forsøgt at opsamle min indtryk af tiden i min blog på linket her <–


1964 Grand Seiko Chronometer med speciallavet ”display” bagkasse (original bagkasse er bevaret!)



Udover Grand Seiko og de flotte og elegant Seikomatic fra 1964 har jeg også et Seiko Olypmpic One-button chronograph samt et Olympisk stopur i min samling og selvfølgeligt også et Seiko Olympiad vækkeur!


Lidt af hvert fra Seiko i 1964!



Desuden inkluderer min samling nogle historiske Seiko dykkerure: Blandt andet de tre første – og måske mest ikoniske – dykkerure, som dækker perioden 1965 til ca 1980: kaliber 6217, 6105 og 6309. Især de sidste to ure så man over hele kloden på armen af “arbejdende” dykkere som formodentligt de mest anvendte og respekterede dykkerure i 70′erne og 80′erne.


Familie foto: første generation 62MAS dykkerur (v) tredje generation 6309 dykkerur (m) og forgængeren: Sportsmatic 30m Silverwave (h)



Og i enhver samling hører der mindst eet lommeur til, i mit tilfælde en Seiko 6110-0010 Second Setting Railroad Pocket Watch.


Seiko 6110-0010 Second Setting Railroad lommeur fra 1973



Er der et grail watch fra Seiko, du altid er på jagt efter?

- Egentligt ikke, nej, jeg har allerede mine grails… Det skulle lige være den legendariske kaliber 5718 kronograf som der vistnok kun blev lavet 50 af til Olympiaden i 1964, men den er fuldstændigt uden for min rækkevide. Men man kan altid håbe, der ligger en et sted i en papkasse på et Vestjysk loppemarket… Så mangler jeg også Seiko’s WorldTimer fra 1964 – et ur som kunne vise tiden over hele verden, og som sikkert blev købt af ikke så få atleter og tilskuer under Olympiaden. Den er til at få fat i for fornuftig penge, og den bliver da også købt i løbet af det næste år!


Hvilke kvaliteter fra østen vil du fremhæve i forhold til schweiziske ure?

- Hmm, spørgsmålet kan besvares på mange måder, og jeg mener i dag, at der er meget mindre polarisering mellem Østen og Schweiz end før. Men hvis jeg skulle vejlede nogen i forbindelse med anskaffelse af et vintageur, ville jeg fremhæve især Seikos kvalitet, historie og innovation i forhold til prisen. Mange ser ure fra Østen som billige efterligninger af schweiziske ure, men når man for eksempel forstår, at viserne i en Seiko er designet med bambus-bladene som inspiration og slet ikke er kopier af ”dauphine” visere, når man forstår at polering af f.eks et Grand Seiko foregår med teknikkerne og en tålmodighed, som stammer direkte fra produktion af samurai-sværdene, når man kan se at produktion af værkerne er fuldstændigt in-house og foregår på et niveau, som stammer fra tusind års forventning om absolut perfektion, så begynder man at forstå de elementer, der er med til at gøre de bedste ure fra Østen så specielle.




1964 Grand Seiko Chronometer



Og er der omvendt noget, som Schweiz har, som østen ikke har?

- Absolut! Det ærgrer mig, at især Seiko ikke fremhæver deres historie i deres markedsføring – fra deres opstart i 1881, over deres første armbåndsur så tidligt som 1924, succeser i kronometer konkurrencerne i tresserne, deres Olympiske historie, introduktion af den første automatiske kronograf i 1969 (og den første automatisk kronograf i rummet i 1973), introduktion af det første quartzdrevne armbåndsur ligeledes i 1969 - her er Schweizerne meget bedre til at flette historien i deres ure og på den måde gøre dem mere spændende. Jeg mener, at et god ur skal – ud over det fysiske og funktionelle – være noget man kan fortælle en god historie på mindst 10 minutter om!

Noget gammelt, noget nyt: sol ring kopi fra middelalderen; Seiko’s 7549 dykkerur fra 80erne



Hvilke reaktioner har du fået på din Seiko samling?

- De er altid positive – og overraskelsen er altid stor! Det hænger netop sammen med, at jeg kan krydrer fremvisning af mine ure med en masse informationer, historier og anekdoter – og grundet Seikos serienummerering, kan jeg datere hvert ur til en bestemt måned og år og knytte dem til et historisk begivenhed. Jeg tror folk bliver positivt overrasket, når man kan fortælle om et ellers lidt nørdet passion på en måde, der taler til både hjernen og hjertet. Nogle bliver efterfølgende begejstret for tanken om at kunne have noget på armen, som kan bruges til at igangsætte en samtale, underholde i en forsamling, måle tid og samtidigt forbinde en til en vigtig historisk begivenhed – et fødselsår og -måned, et afgangseksamen, et bryllup – og ender med at købe deres første ”voksen” ur.



Hvad antager folk fejlagtigt om Seiko efter din mening?

- Helt sikkert at der en antagelse om, at Seiko ure er nogle gode ure – men at de ikke er “fine” ure. Hvis jeg presser lidt, har jeg fundet ude af, at et “fint” ur altså er et ur med historie, et ur som man kan fortælle noget spændende om. Og her antager folk altså, at Seiko ure ikke har et langt og spændende historie – og derfor er det virkeligt dejligt, at jeg her kan forsøge at udbrede lidt mere kendskab til dette spændende mærke, samt til begrebet ”at gå med ur”.


Mange tror også et det er svært at restaurere eller vedligeholde ældre Seiko ure grundet mangel på reservedele fra fabrikken. Men Seiko arbejder ude fra “bygge kasse” princippet, og mange dele – og hele værker – kan skaffes for ingen penge på f.eks eBay – fidusen er bare at vide, hvad man skal lede efter!


Seiko 6309 dykkerur som er i gang med at få et hjertetransplantation fra en donor kaliber 6309… operationen lykkedes!



Hvor begynder den store Seiko jagt, hvis man er på jagt efter et gammelt ur?

- Det begynde først med noget research. Der er mange resurser på nettet – netop Seiko samlere er kendt for deres glæde ved at dele viden og erfaringer. Her er det især Seiko and Citizen Watch forum (www.thewatchsite.com) jeg vil fremhæve, og så min egen blog på www.vintageseikoblog.blogspot.com

Man kan med fordel begrænse sin jagt ved at gå efter Seiko fra et bestemt årstal, eller årti – her er Seikos serienummerering som sagt enestående, og man kan finde ure fra et bestemt år og måned. Alternativet kunne være Seikos historiske dykkerure fra perioden 1965 til 80′erne. Her kan alle være med, og man kan opnå en spændende samling for overkommelige penge – men research her er afgørende! Skal man gå efter det ypperste, altså ure som kan måle sig med det, vi betragter som de bedste high-end ure fra Schweiz, så hedder det Grand Seiko (både vintage og moderne) og Credor, men så skal pengepungen altså også være i orden.


Hvad skal enhver mand vide om Seiko ure?

- At Seiko – og især vintage Seiko – giver mere historie, information, kvalitet og oplevelse end de fleste andre mærker. Men i sidste ende gælder det, at man netop med Seiko ikke kan købe sig til oplevelsen. Man er nødt til at lave det nødvendige benarbejde og research – til gengæld er glæden ved at bære et vintage Seiko enormt!

Friday, April 16, 2010

Seiko Tuna 300m 7549-7010 disaster, diagnosis and repair





Happiness is a 7049-7010, Sharm-el-Sheikh, January 2010. Little did we know...


It was a dark and stormy night - I lent my son my Tuna to time a five minute foot bath (his foot), and he unintentionally dropped it on a particularly hard floor. Subsequently it ran intermittently, stopping for a while only to run again an hour later. This carried on for a few days, so I opened her up, checked the battery was seated ok, and it was.




Battery seated, as per spec....the plot thickens


At this stage my immediate reaction was to install a spare 7548 movement I have been saving for a project and send the 7549 module for a service. However, 7549 hands will not fit a 7548 movement, as the 7548 movment was developed on the basis of the 6309 mainplate, canon pinion and hour wheel. I wonder if Seiko originally planned to use the 6309 auto caliber in the Tuna, and switched to quartz during its development? Anyway, I was in a quandry as to whether I should install the 7548 caliber with 6309 hands, or whether I should retain the original caliber, dial and hands.


At that precise moment I received a mail from Ken Setser, who encouraged me to take on the diagnosis of the faulty movement, and provided me with a step by step diagnosis strategy. Ken wrote:Harry,The first thing you want to do is to determine if you have a mechanical or electronic problem. 1. Check the battery2. Check to make sure screws are tight and battery insulator is in place. 3. If everything above checks out then you want to get a small compass and set it on the coil(copper colored). The coil should pulse every second and the hand of the compass should deflect whenever it pulses. If the compass hand moves then the problem is mechanical. If it doesn't then the problem is electronic. 4. You want to determine if the problem is in the coil or the electronic module. If you have a ohm meter you can check for continuity in the coil. My guess that the coil would be the problem if it is an electrical problem. If you can, do step 1-3 and let me know what you find. Ken


Under the microscope I was able to confirm that all connections appeared to be intact, and that the jewels and wheel where sitting correctly.




Jewels and small things seated as they should be.



More of the same. I like microscopes.


The next step was to test the coil. A quick trip to the local tourist store netted a small compass, which I placed directly on the movement.



The compass was placed directly on the movement.


For a particularly fascinating video, please see: http://biocomm.eu/7549repair/5.wmv (Remember popcorn). Say, does anyone know how to embed a video?


OK, so YouTube it is:




Hear the tock-tock in the background? Thats our grandfather clock!


So I proudly answered Ken:


Hi Ken I can confirm that when the watch stops, the compass stops moving (as opposed to the 1-sec pulses of the needle clearly obvious when the watch is running), suggesting that the problem is electronic. The movement tends to restart when I wear the watch, but leaving the watch on a hard surface overnight will leave it in a stable state, ie running overnight if left when running, dead overnight if left when dead. I have tried gently prodding the movement to induce running, without luck. The movement will often start running when I loosen the caseback, but not always - I'm sure this is an important piece of information... Am I correct in assuming that the next phase is to localize the source of the sporadic elctronic breakdown, between and including the battery (tried two new batteries) and the coil, on the circuit block itself? Incidentally, I have a spare 7548 movment - would it help troubleshooting to try to replace the 7549 circuit plate and coil with the entire working 7548 circuit plate and coil block, then with the 7549 plate / 7548 coil and vise versa? Of course, if the 7548 plate and coil are a straight switch (wishfulthinking) the problem would be solved, but I would really like to identify the source of the problem just for the challenge of it... The quest continues - I feel like I am playing a sort of WIS chess here! RegardsHarry


Almost immediately Ken replied:

Harry Great troubleshooting techniques. Here is what I think and what I would do. Since the problem is intermittent, I suspect a loose connedtion somewhere. Could be the battery to circuit; circuit to coil; or internal coil problem. I have attached some tech sheets for the movement so you will have some reference. 1. Check the - battery contact to make sure it is firmly attached to the circuit board. Also make sure it is raised enough to make firm connection to the battery 2. Make sure + battery strap is firmly attached to both sides of the circuit. 3. If you look at the circuit just to the left of the word "Japan" you will see a small cutout. Look in the cutout and you will see two gold colored fingers. These are the connections from the circuit to the coil. Make sure they are touching the coil underneath. The best way to do this is to remove the circuit and turn it over. the tech manual has the steps. 4. After you remove the circuit you can check the resisance of the coil. The resistance doesn't matter so much in your situation, only if it is open. 5. If, after doing steps 1-4 everything is ok then clean all the contact points with a pencil eraser, making sure you remove all bits of eraser when done. Reassemble the watch then try it. 6. Let me know what you find. Ken

So, at this stage I was sitting looking at a 7549 movment with an electronic fault, and beside it I had the 7548 movement I had originally planned to insert as a donor movement.



Left: faulty 7549 movement, right: 7548 movement. The mind boggles.


I then remembered that the 7549 was built around a 6309 mainplate, and it began to dawn on me that the 7548 and 7549 movments had different canon pinions and hour wheels (and thereore different minute and hour hand hole sizes), but the two movments I had before me seemed to have identical circuit blocks and coils! I quickly dug out a spare 7546 caliber movement, and again the circuit block and coil appeared identical!



Left: 7549 circuit block, right: 7548 circuit block. Background: artfully placed technical manual sheet.



Left: 7549 circuit block, right: 7548 circuit block.



Throwing caution to the wind, I replaced the circuit block with a circuit block from a 7546 spares movement.




The FrankenTuna, with culprit coil, and now-spare-7549 circuit block and magnetic shield.



While doing this I noticed the antimagnetic shield plate was missing (!) from the original 7549 movement, so I also scavenged the ditto part from the 7546. This failed to solve the problem, but I remembered that the 7546 movement was dead when I got it (these things happen when you get to my age) so the next step was to transfer the coil block from the 7548 movement and - hey presto - it lives!

The lesson learnt thus far is that 7546, 7548 and 7549 coils, circuit blocks and antimagnetic shield plates are freely and easily interchangeable. Considering that it is relatively easy to source 7546 and 7548 parts movements, this could certainly be useful information for some!

I fitted the now strongly-running movement into the case, snugged down the caseback and now have a caliber 7549 Tuna running a caliber 7548 coil in a caliber 7546 circuit block! This is the beauty of the 6309/6 and the 75xx series - they are so closely related and follow Seikos "Lego block" approach!

This amazing thing in this story, however, is that a professional watch restorer like Ken Setser would take the trouble to contact me, and the time to walk me through an extended diagnosis and repair process. And therein, children, lies the essence of the spirit of our WIS community. Thanks, Ken.

Tuesday, April 6, 2010

SEIKO PROFESSIONAL 300M Diver, unveiling & review

Arrival and impressions

Finally, the great day arrived, as did my 300m Tuna! Thanks to Jau Yuan in Taiwan for a great transaction and a wonderful timepiece! We had just arrived home from an extended weekend in Holland, so I had ample time to change the wave vent rubber strap to a black NATO, and the bezel insert to a 6309 insert (which clicks right in, in case you where wondering) while the missus and kids emptied the car. The "mod" took all of ten minutes locked in the bathroom "Yes, dear, coooming!!" and the old insert is winging its way to its new home in the US. Let me show you some comparative pictures of the "Mod":





First, my two standards, 7T92 chronograph and 6309-7049 150m diver.





Size comparison of 7T92 on NATO with 300m diver





Strange how the NATO strap fits so perfectly to the “Tuna”, but just doesn’t work (for me) on the 6309. Incidentally, removing the spring bars was an absolute cinch due to the fact that the lugs are drilled through – brilliant! A quick look at the back cover and the documentation revealed that this watch was produced June 2007 and purchased in November 2007! Wow – another five years to the next battery change! First impressions after wearing the “modded” Tuna for an hour are that it is easily as wearable and comfortable as the 6309. The domed crystal is very reflective, and distorts the view of the dial and hands significantly when viewed from the size, fittingly reminiscent of the domed portholes of a bathysphere.





Size comparison of 150m vintage diver with 300m diver





Size comparison of 150m vintage diver with 300m diver





Size comparison of 150m vintage diver with 300m diver



Dial layout and especially hands are comfortingly similar to my 6309 – the hands, descencant from the 6309 divers are simply superb, and this series of hands are in my opinion the best dive hands ever developed! I noticed the lume is slightly creamy and very neatly applied! The crown screws in and out smoothly and competently, while the rough edging makes it easy to grip. The bezel on the other hand is a little difficult to grip and turn due to the shroud, but ratchets nicely once turning. I was also a little surprised to see the taper on the shroud, from base to top – I thought the Tunas where called so because of their non-tapering, grey shrouds?



The SBBN007is part of the Prospex series designed for professional and saturation divers. Ikuo Tokunaga was the chief designer of the original Professional Divers, and has contributed in no small way to forums such as the SCWF – a real privilege for Seiko fans and an honour quite exceptional in the watch world. The SBBN007 makes no compromise to fashion, and encompasses all that I look for in a tool watch: function, legibility and robustness. A little detail I wondered about was the presence of the day/date on a pro-dive watch, until I read about how long saturation divers spend under water…



The SBBN007 is a direct descendant (introduced in 1986) of the vintage Seiko 7549-7010, introduced in 1978: “The first professional quartz diver's watch model of 300m saturation diving specification in Japan. The movement is [7549] caliber which has 5years battery life. There are 17 new technologies, such as L shaped glass gasket structure, glass screw ring fixing structure, twin side shield crown structure, special elastic strap made from polyurethane rubber same as 600m professional diver's watch [*from Tokunaga-san’s watch museum website*]. Compared to the original 7549 300m quartz diver, I prefer the black bezel, fine-knurled crown and slightly sleeker shroud of the original. However, I prefer the dial of the SBBN007 and as stated above my first mod was to exchange the steel bezel insert for a black insert from a 6309 diver allowing me to enjoy the best of both worlds!







So, enough with the emotional stuff - lets move on to some hard facts:



300M water resistance with a screw-down crown and screw-down back, saturation-qualified

The “He-GAS DIVERS 300m” on the caseback has relevance for saturation diving, where deep divers work at depths greatly exceeding the normal dive depth of about 130 feet. These divers work and live under extreme pressure for weeks at a time, under conditions where helium (a small-moleculed gas) in the air can seep past the seals of a watch. If this excess pressure is not released under decompression, the crystal can blow out. Omega and Rolex address this problem using release valves; Seiko solves the problem using its innovative L-shaped crystal gasket.



Dimensions: 43mm (without the crown) Thickness: 14.3mm Weight: 116g



Strap: Rubber Wave Vent Daloaz Z-22 (lug width: 22mm)

The Original Seiko Wave Vent Daloaz Z-22 strap is apparently specially made for the Prospex divers, and is made from polyurethane rubber. The vents allow the strap to “give” while diving, retaining tension on the arm under pressure and eliminating the risk for the watch to become loose on the arm and move out of the line of sight. Aesthetically I prefer the simpler straight vent Z-22 of the 6309-divers, but have seen pictures of the SBBN007 on a black Nato which looked particularly good.





Wrist shot on 19 centimeters = 7.5 inches wrist



Crystal: Dual curved Hardlex

The Hardlex crystal is a Seiko innovation: harder than regular mineral glass, more shatter resistant than sapphire. Apparently, there are at least two grades of standard Hardlex as well as a high-quality HARDLEX "used for the PROSPEX watches and ordinary sports watches" (Tokunaga-san, SCWF, 2002). The extremely domed crystal can give rise to excessive reflections, but under water viewability is excellent.



Lumibrite luminous paint at hands and marks

The lume used in the SBBN007 (and my IWW’d 6309-7049) is Seiko’s own Lumibrite, generally acknowledged to be the best non-radioactive lume on the market – as evidenced by the fact that it is used by Swiss manufacturers such as Omega, under the name Superluminova. According to the manual, if exposed to a light of more than 500 lux (average room luminance), for approximately 10 minutes, LumiBrite can emit light for 5 to 8 hours. While I find the luminescence lasts all night, I particularly appreciate it under the low light conditions we have in northern Europe at this time of year, which saves me a lot of squinting to read the time



But…its just a Quartz!

Ah yes, but WHAT a quartz, WHAT a pedigree! Movement: Quartz 7C46. 5-year long life battery (SEIKO SR43SW) Frequency of crystal oscillator: 32,768 Hz (Hz = Hertz … Cycles per second … my 6309-7059 runs at 5Hz ) Accuracy: +- 15sec/month.







The in-house, 7-jewelled 7C46 movement is a high-end, adjustable, high torque quartz movement used in this the 300m diver as well as the 600M Quartz Prof. Diver (7C46-6009) and the 7c46-7009 Professional Diver's 1000m. The pedigree here speaks volumes about the movements quality. Cheaper quartz movements may have a single (or no) jewels and no possibility of regulation. Irrespective of the WIS attitude to the “soul” (or not) of quartz watches, they are more accurate and stable than mechanical watches. The 32,768 Hz oscillation of a quartz watch is considerably more regular than oscillations of the balance wheel of a mechanical watch, and their accuracy is not determined by the wind state of a mainspring. Furthermore, their accuracy is not as affected by shocks, or by the position of the watch, or to mechanical failures (due to their paucity of moving parts – all factors making them ideally suited as tool watches. However, quartz movements are inherently sensitive to moisture, an argument which has been used to promote mechanical movements in dive watches. Whatever, I have quartz and mechanical movements in my collection, each of which gives me the opportunity to tell about their virtues, their specifications and their developement.



In summary...

All in all the 300m diver lives up to my expectations. With the bezel mod I feel I have brought my watch a step closer to its historic legacy. I appreciate the quartz accuracy and the fact that it is ready to go as soon as I pick it up. It is a big watch, but not uncomfortably so. It makes a statement but is easily wearable. The dial and hands are easily readable under all conditions. All in all, a great addition to my tool/dive watch collection and a watch which will be competing actively with my 6309-7049 as my daily wearer. It will be interesting to see if I can differentiate between wearing the 6309 and the Tuna...



Oh, one more (important) thing, she-who-sees-all hasn't realised I have bought another diver - to her they look the same! Actually, this is the most expensive watch i ever bought (my IWW'd 6309-7049 is in the same league, but was picked up as the result of a trade). But it is a nice feeling buying something this nice, being able to collect so much knowledge about it and sharing the experience with others who have the same passion

7549-7010 Tuna in Sinai, Egypt

For the last two weeks I have treated my Tuna and the rest of my family to a trip to the sun, more specifically to Sinai, Egypt...



We spent some time travelling by camel and 4WD in the desert...





















...which can be thirsty work...







But most of the time we spent at the pool...



























...with a two day trip to Cairo...







...or exploring the coral reefs just outside our hotel:















In spite of all this stress, I was able to keep up with forum news, read three novels, watch five films, hear a lot of music and take some pictures on my iPhone!







I have never in all my life seen so many fake Rolexes in one place, but in the midst of it all I saw a 6309-7040 on a Z-22 strap on the arm of another Danish guest. We got back home this Tuesday to 1.5m of snow!