Based on the photos, it's a ladies Omega Sapphette cocktail watch from the 1950s/1960s.
Possibly powered by the tiny Caliber 482 which is only 12.5x15.5mm in size.
I don't think the bracelet is original Omega, possibly a custom made one.
As they not sought after by collectors these days, the value isn't as high as it would be for a gents watch from the same period.
Valuations can vary wildly for these watches, but it is unusual for them to fetch much above scrap value unless a particular buyer (or two) wants that design.