Hi All! I’ve recently purchased my first omega, a Speedmaster Reduced 3510.50.00. I really do like it! Couple days ago asked my watchmaker for an overhaul and got a bit surprised. The watch is from 1993 based on the serial number. Now the rotor on the movement has the caliber number 3220 on it, where as the base movement seems to be an ETA 2890-2. I’ve done some research and it does not add up. Furthermore inside the caseback I found two references; 175 0032 and 175 0033. Pictures attached. What do you guys think? Is it a franken one? My other idea would be it was sent off to omega previously and they’ve changed parts in the movement? But what could have happened to the caseback? Should it not have only one reference? Any comment is appreciated. Thanks!
What is not adding up? The double caseback stamping is normal.its the case part number during this era. What chart are you using to date it?
Normally Omega Caliber 3220 should come with base caliber ETA 2892 or 2890 A2. Early Speedmaster reduced caliber 1140 was equipped with ETA 2890-2 according to all sources I could google. S/N is 54******, I used below link to determine mfg date: https://omegaforums.net/threads/wha...e-in-the-omegamani-serial-number-chart.68711/
The 1140 stamped rotor is discontinued, so if it required replacing the replacement for it is the 3220 rotor. Nothing franken about this at all that I can see, and the watch clearly came with an 1140 series. The double case stamping is also nothing out of the ordinary...I've seen as many as 4 case numbers inside a case...
Hello, interesting, I also have a 3510...form the late 1998 and observed the same stamping on the movement : ETA 2890 A2 with a new rotor 3220. In addition there is a DA2 on the left. Does anyone know if that refers to a certain year? THX a lot