The number you mention is the movement serial, not the reference. It can be used to date the watch I believe, although I do not know the serial lookup by heart. The reference number would normally be on the inside case back, along with a bunch of other marks. Your doesn't have this. This suggests it's not an omega case. Because it's gold, watches were sometimes cased locally to get around gold import fees.
Hopefully someone more knowledgeable will come along and give you more specific info on the case, also on the dial and hands, and the crown. I'm not familiar enough with Omega time only watches to be more help. Good luck and welcome to the forum.
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