Seiko 6309-7040

Not a lot more can be said about Seikos 6309-7040 to be honest! There’s a wealth of information out there but a quick history of the watch is that it was the replacement for the previous asymmetric 6105-8110 diver, and the key changes were the turtle type case design with a proper screw down crown, a fully printed dial that did away with the framed lume wells and a completely redesigned automatic, 17 jewel, 21,600bph non hacking movement. There’s a famous image of Mick Jagger wearing his in the seventies so he’s obviously a man of good taste ,not withstanding the fact he has supermodel Jerry Hall on his arm!

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The watch featured came in for a service and a repair to the crown, and is an example from August 1980 that looks to be in very good original condition.

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It’s even still on it’s original GL831 rubber strap!

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Here you can see a common problem with these crown/stem assemblies. Because the stem has a shoulder where it meets the crown over tightening it can put undue strain on the threads with the result it eventually shears through metal fatigue.

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The 6309-7040s stem is a spring loaded affair with a male and female end, this assembly takes up the play as the threaded crown is screwed home.

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The dial and hands are in very good order.

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The movement looks very good, just evidence of dried lubricant here and there.

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The same on the bottom of the barrel arbor.

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The watch was fully stripped ready for cleaning and inspection.

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Once through the machine and inspected the re-assembly begins with the mainspring.

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A spotlessly clean mainplate ready for the top balance jewel.

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The going train coming together.

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Pallet fork and bridge fitted along with the main bridge.

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The autowind bridge fitted signifies the motion work is complete.

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The keyless work installed on the calendar side.

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A close up of the bevelled date window that was a feature on Suwa dialled models up until 1981. “Suwa dialled” refers to the Suwa factory symbol appearing below the 150m logo.

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Handset now refitted.

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And now recased so it’s time to sort out that broken crown/stem assembly.

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The old crown and stem are essentially useless as the broken threads are stuck in the crown and the male part has no threads left! A NOS crown and stem were produced from the parts drawer.

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The rebuilt assembly.

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The case ready for closing.

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It passes the pressure test with no issues.

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And here she is ready for the next few years. It’s always nice to see these classic Seiko dive watches in good original condition.

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