I know little about watches and inherited this watch. I don't know how to open it. I guessed at the manufacture year because I've no idea and there was no option to indicate this, and I would have to open it, which, as I said above, I do not know how to do. The only info I can find is on the back. The number: 5045349. I assumed this is the serial number. 10k Gold Filled
Case Serial No.