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Bulgari

Maybe. Who knows.

 

Patek Philippe had made a modification from the 315 to the 324 movements.  They were relatively minor.  But enough for them to make a new caliber number for it.  The two movements look physically the same to my eyes.  These Bulgari movements to me looks somewhat different to my eyes, yet retain the same BVL 138 caliber number.  So I wonder if there's a standard for this. 

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