Hey Bacaitlin,
Sorry to hear about your Dads passing! This is a nice piece of family history to remember him by. Based on the case design and the fonts used on the dial I'd estimate this to be from the early to mid 60s with a cal. 56x movement inside. Omega just changed the vintage data base and I can't find the new link at the moment and without a serial or reference number this is the best I can do right now. When I find link I"ll include it and any additional info I find. This is a nice heirloom piece!
Cheers,
Ed
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