Hi,
welcome here on Omega Forums.
I think it is more likely that the watch is from the 70ies, could be a 1020 movement inside.
If you like to wear the watch -as you pointed out- I think it's no problem if you polish the crystal.
You could try to get you a golden 1503 Omega bracelet (of course you can keep yours as well)
View attachment 680903
I wouldn't expect too much (money) value for this watch, just wear it and enjoy it!
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