Omega Cal. 751 experts needed :-)

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To quote Al:

"The movement uses an indirectly driven sweep seconds pinion, and this design can be a bit jumpy if the friction spring is not adjusted properly or is damaged.

This is a simple adjustment for any competent watchmaker to make, but only if the watch has had a fairly recent service. If it hasn't been serviced in several years, it's probably worth getting that done, and the friction spring will be addressed as part of that service.

Cheers, Al"

Thank you for saving me some typing - definitely this and not a CP issue.
 
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Thank you for saving me some typing - definitely this and not a CP issue.

Thank you Archer for your comment!