MYSTERIOUS 7762 CALIBER

The caliber of this movement is cal. 1225. Pretty standard Rolex manual winding movement that they made for a long, long time.

More information is available here:

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Rolex_1225

The four-digit number is actually a serial number. Probably used internally at Rolex to keep track of the movement or match up parts. We don’t know for sure because Rolex has never published or shared serial number lists.

However, there are other cal. 1225 Rolex movements that have serial numbers:



Hope this helps,
gatorcpa