I've just bought my first vintage Omega and wanted to enquire about it's authenticity. One thing I'm confused about is that the back reads 'seamaster' but the watch is a geneve. Is it possible the back is from a different watch? Here are some pics:
Also, yesterday I noticed that it lost some time. I wound it at 4pm in the evening and slept with it on (to make sure it didn't stop). Currently it seems to have lost about 30 seconds (so thats 30 seconds in 17 hours). Is this normal or does it need to be serviced?