What is that

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Late 70s-80s ladies watch, pretty small at 26mm. Reference number is 516.0001

See a thread here with someone discussing it: https://omegaforums.net/threads/struggling-to-set-day-of-week-and-moonphase-help.130660/

Based on the lower-budget looking dial, I'm guessing you have a 'later' one than the one in that thread.

Similar one to that one here: https://www.vintagewatch.jp/view/item/000000001851

Overall, I don't think there are enough of them out there, nor enough people looking for them to judge value. Only way to really tell would be to go to auction.