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OSSO wristwatch stops and runs


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I am servicing a wristwatch named OSSO for a friend. The movement is Felsa cal690 automatic. 25 jewels Bidynator.

I see something strange here I have not seen before.

When the watch is face up it stops after 5-30 seconds. If I flip it over, face down, it starts automaticly. Then I flip it back to face up, then it stops.

Ideas?

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DJT2: Thank's. I'll check that. I will check the top jewel when the watch is facing down (the balance cock jewel).

Vinn3: I did, during service, removed the balance from the mainplate - and it looked fine. BUT i did not (come to think of it) include the balance and the balance-cock in the cleaning liquid. And I did not remove the jewel itself and inspect it isolated. 

A new day, with new knowledge. This is going to be a good day! :-)

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Hi Tin Tin, since you did not clean the balance jewels that would be a good place to start.. did you dismantle the balance jewels in the mainplate?

While you have the balance off..inspect the pivots closely.... it may have mushroomed or bent.

 

Anilv

 

 

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