I am not hugely into vintage watches, but I have recently come into possession of my late uncle's Omega Seamaster - his sons had it for the longest time but weren't restoring it, so I decided to take action. I'm hoping to get some help with determining the year of production, as well as well as some clarity regarding the unique dial.
Based on the information found when we opened the caseback, it has a serial number of 15475169, the movement is Cal. 471 and the model reference is 2828. Based on this, does anyone know the year of production or how to determine this? Also, while the inside of the caseback indicates it is a 2828, the dial has a crosshair on it, something which I can't seem to find on many other Seamaster 2828 references. Were any 2828 references produced like this? Or is there a chance that the dial was modified at some point?
Thanks for your help!