Hi all,
In the number charts this particular serial number shows for info: "various calibers"...
I have a simple explanation for the non existing number in the official number charts section for 12 SC:
The bridge has been swapped and most likely it derived from a cal 12-120.
Or the SC-mechanism which was built by Piguet and not Patek themselves was added later... maybe done on request in the Patek factory?
Only PP will be able to tell you more!
My suggestion: Order an extract from the Patek archice!
kind regards
Erich