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Patek Philippe

3970 chronograph issue

 

Friends -- my 3970G black dial is recently back from Henri Stern NY after a full service.  I have noticed that when I now start the chrono, ~80% of the time it works just fine but ~20% of the time it is quirky -- specifically, the chrono seconds hand jumps forward to the 5 or sometimes 10 second mark when the pusher is pressed and begins from there.  Again, this only happens ~20% of the time and it is usually when the chrono has not been run for a while.  Is this normal behavior?

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