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It looks like a 70s Constellation. Will have one of the slimmer 700-1000 movements in it. Not collectable but still a nice watch.
All the information is inside the caseback with the Cal# and Serial# on the movement and Model# on the inside of the caseback.
Find a watchmaker with an Omega parts account and they should be able to service it no worries. Don’t send it to Omega as will cost a lot more… Nice moment and looks like it’s been kept well.