The picture of the back of the watch would help.Is it a solid gold or gold plated? What's going on with 12,6,9 hour marks? I've paid $450 for mine. Sent from my SM-G930T using Tapatalk
The reference number would be located inside the case back. Have a watchmaker remove the back and take a pic of the inside back cover and the movement! That will tell the story
Gold case back should be on the gold case, 14 or 18 k??? I'm not sure who put the diamond 12,6,9 hour marks, not Omega I guess. C6357 perhaps? Sent from my SM-G930T using Tapatalk
Reading this will help us help you. Pay special attention to point #1. https://omegaforums.net/threads/vintage-omega-posting-guide.383/ Multiples of the same photos is no help.
Looks like the back dosent come off .looks like the front comes off and u take movement outta case. note groove under bezel.
Take it to a watchmaker (not a jewlery store) and they should know how it open it up safely without damaging anything