Chinese SEIKO NH25A Auto Regulation.

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Chinese SEIKO NH25A Auto Regulation.

Postby scared off member » August 22nd 2010, 9:54am

I've been adjusting the one lever that moves a visible pointer. There is also a second lever, what is its relation to regulation of this particular movement?
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Re: Chinese SEIKO NH25A Auto Regulation.

Postby Guest » August 22nd 2010, 10:23am

Do not move the second lever. It has to do with the isochronism, and if you screw with it, a watchmaker will have to fix what you've done.
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Re: Chinese SEIKO NH25A Auto Regulation.

Postby nhsmitty » August 22nd 2010, 10:25am

Assuming this is similar to a 7s26, and I think it is, it's the beat adjustment.

DON'T touch the second lever. It adjusts the beat of the balance wheel and when thrown off it will make the movement prone to not starting, stopping, running erratically. Or so I've read.

Read the paragraph near the 5th pic in this link. http://users.tpg.com.au/wookie99/regulatingwatches.html





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Re: Chinese SEIKO NH25A Auto Regulation.

Postby Guest » August 22nd 2010, 10:44am

Thanks Guys!
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Re: Chinese SEIKO NH25A Auto Regulation.

Postby koimaster » February 8th 2018, 10:58am

ttt
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