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TST 1000m


The history of the Seiko based TST.



The idea for the Seiko based TST came about after I bought my first Seiko Tuna which was a 7549-7010 which required work due to the fact it had been flooded.







I was able to repair or gather most of the parts I needed but I could not find a chapter ring anywhere in the known WIS world :(



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I also found it extremely difficult to find OEM Tuna vintage parts which was really frustrating :)

While doing the restore I was measuring the case etc just to see what would and wouldent fit with interesting results but due to the relative rarity of the 7549 I didn't really want to start modding an original.

So I started looking at other Seiko cases (diver) that I could perhaps customise in the image of the Tuna, the first case being the 6309-7040 and after comparing sizes etc this became the start of the TST mod.
















Over time and after numerous checks I decided it would work and set about designing holding fixtures, deciding on machining methods and obtaining the tools and machines needed for this project, if I had been intent on just producing one for myself I wouldent have needed all the tooling and fixtures I now have but with having a engineering background I decided I wanted to do it "right" from the beginning :)

The main machines I started off with were a SIEG Super C3 lathe and a SIEG Super X2P mill. I still have the mill but the lathe even though it did some good work was not really up to the job. I have now replaced the lathe with a Myford Super 7, old but real nice quality.

As I am always looking to improve how I produce the TST I am constantly looking for better methods, tooling and doing minor modifications to fixtures to assist production which helps to maintain the quality of the finished TST.

All the machines I use are manual which makes for the production being very labour intensive.







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A 6309-7040 case machined/profiled and tapped to accept the TST shroud.
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The TST shroud produced in 316 stainless, these are a close copy of the 7549-7010 shroud and indeed fit the 7010 but they are not exactly 1-1.
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If you have any questions just click on the "TST Q & A" button above, if you don't find the answer to your query then please contact me by email, details on specifics can be found by clicking the relevant button, the "TST Slide Show" has a few examples of what can be achieved with imagination and of course the required parts :)
The "Big" crown, I modify a standard crown (70W22NS) by turning it down and then making an adapter that is press fitted over the modified original crown at extra cost.
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