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Discussion Starter · #1 ·
I just made an impulse purchase without even knowing what I was buying. The seller said it shares the same dimensions as the 300m Seiko Tuna Can. Dial says "Tektron 200m" and the watch is powered by an unknown but japanese quartz movement. Here is the seller's pic with kind permission:





Does anybody know or have ever seen this kind of Tuna or the brand name? I would love to know more of its history and origin.

TIA and cheers,
Mario
 

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I did run across one I think on the bay once but never had one in hand to crack open and look inside. You'll have to post some pics of the movement when it arrives.
 

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Discussion Starter · #5 ·
Postie was here today, so it's about time to share my first impressions...

The watch in question:



Dial says "Tektron 200m Water Resist Quartz Japan Movement"









...looks very similar to those 300m Seiko Tuna Can's...




(left: 7549-7010; middle: Tektron Tuna; right: sbbn007)

...but that's all about the similarities It looks and feels much cheaper compared to any Seiko Tuna I own (1000m 7c46-7009, 300m 7549-7010 and 300m 7c46-7011). The crystal seems to be a cheap mineral crystal and the bezel is a unidirectional but with a lot of play, perhaps due to the single bezel spring. The crown is not a screw down but a push in crown. Unfortunately I have no case-opener so I am not able to tell you what kind of movement it uses. I'll provide some pictures of the movement as soon as I can. However, the movement hacks and has a day/date quickset. The day disk is bi-lingual (english/spanish).

Now let's take off the shroud...









The base case seems to be very similar to the Tuna cases, although the shroud seems to be lighter compared to the original ones (7549 and sbbn007). The shroud of a sbbn007 is a direct swap, but unfortunately the Tektron shroud doesn't fit the sbbn007 or the 7549-7010 due to a slightly shorter diameter. Perhaps a little filing would do the job



...some comparison shots...





...the pvd'd shroud of my 7549-7010 is also a direct swap...





Lets remove the bezel....



...there is only one single spring in place. A comparison shot of the Tektron bezel (left) next to a bezel taken off from a 7548 diver (right)....



...and next to a sbbn007... the sbbn007 uses a screw down crystal retaining ring while the Tektron Tuna uses a press down ring...





The Tektron Tuna has a much lower profile, maybe due to the different caseback. Another naked Tuna shot together with the bezels (left: Tektron; right: sbbn007, top: 7548):



And finally a group shot:



Conclusion so far: the Tektron Tuna is a nice little shrouded Diver but it cannot compete with any Seiko Tuna. No screw down crown, no screw down crystal retaining ring, cheaper materials and I have yet to find gaskets/seals

However, it is another unknown (to me) shrouded diver and I am very pleased to welcome it in my small but humble (and slowly growing) collection of Tuna's. Now the search goes on for a 500m Scubapro Automatic Tuna and a 700m Ricoh Quartz Tuna

Feel free to post your comments and thoughts about the Tektron Tuna....

Thanks for reading...
 

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Discussion Starter · #7 ·
I just returned from a local watchmaker who kindly took off the caseback, so I was able to take a couple of pictures:





Please welcome a tiny miyota no jewels quartz movement :)

Now the most important question is: will it be possible to replace this miyota with an automatic Seiko 6309 or maybe a quartz 7548 movement? b-)
 
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