Great looking watch. I am no expert, but it could be a cal 500 ?
https://omegaforums.net/threads/flea-market-seamaster-500.8923/
If you plan to keep the watch a few things I'd do (experts feel free to correct me):
1) Be careful of the band, cheap metal ones like that COULD damage the case
2) Do as direct by @
Foo2rama
3) If you plan keeping the watch, have an EXPERIENCED watch maker service the watch--- Do your homework here and find someone good. This will be a few hundred USD, but is worth it for a family heirloom like this
Great find and welcome to the board
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