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Bulgari

Seconds hand "stutter" can be the result of misadjusted "end shake."

 

My understanding is that "end shake" is the degree of freedom pinions have to move: too little, they can't turn; too much, they may turn erratically. I have taken a watch like that to a watchmaker and he has been able to correct it without difficulty.
No clue about the other issues.

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