My guess is that the watch is from the early to mid-1960's. The "T" (for tritium luminous material) after the words Swiss Made on the bottom of the dial wasn't used until around 1963. Probably a caliber 550 or 552 movement inside. Both are very good Omega automatic movements.
Crown doesn't look correct, nor do I think the bracelet is original to the watch.
It is not a particularly high-value item. Maybe $300 or so, depending on the condition of the movement.
Cost to service would be close to its value, but as a family piece, that should not be important.
Hope this helps,
gatorcpa
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