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Seiko Movement 6T63 = Hattori VK63? and other questions.

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7.4K views 1 reply 2 participants last post by  Joe Horner  
Z
#1 ·
Hi, all.

Long time lurker, first-time poster. I have a Seiko 6T63-00A0 with the mecha-quartz movement. The watch is giving me problems. I'd like to try to repair the watch and I have questions.

1) The stopwatch hand does not reset to the 12 position after pressing the B-Button. It randomly resets to the 9 position for a week or two, it will then reset to the 3 position for a couple days. I've tried to adjust the stopwatch hand similar to the 7T92. No dice. Has anyone else experienced this issue? If so, is there an operational fix?

2) I've been researching how to replace the movement. The 6T63 movement is hard to find. Essingler has a Hittori VK63 in stock. The dimensions appear "identical". Are the 6T63 and VK63 interchangeable?

3) Can I reuse the OEM Seiko hands? The VK63watch hand sizes are hour 1.50mm, minute .90mm, and sweep second .32mm. The TMI Technical Guide and Parts Catalog, page 12 says that chronograph hands should not be reused. I'm having a hard time finding suitable replacements for the .32mm on Esslinger. Can someone point me in the right direction?

Thanks all, this forum's insight is greatly appreciated.
 
J
#2 ·
They're essentially the same movement, without spending time I haven't got looking up specs I cant guarantee that the hand sizes are the same for all the hands - a few of the Seiko / Hattori interchanges over the years have used slightly different sizes.

The reason for not re-using the chrono hands is that the movement has a mechanical reset which puts a huge acceleration on the hand as it resets. A previously fitted / removed hand may not be tight enough to prevent it moving, messing up the reset point.

Once upon a time they made centre chrono hands nice and tough with a good size pipe that would stand up to re-use. Now many makers simply treat them as disposable - some even tend to pull clean off their pipe when you remove them! Which is fine if they're available but not so great if they're restricted or obsolete.

With careful removal and fitting you've got a reasonable chance of re-using the existing one, and won't damage anything (except the hand) if it's unsuccessful.
 
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