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Pics aren’t great but it looks ok to me. Not sure on the crown shape though, did he show a pic of the crown side?
Yes, I have a side pic of the crown and it bears the Omega sign, only it is worn out.
Crowns are easy enough to source and if you get it serviced by a watchmaker with an Omega parts account, they will get the correct service crown for it. Original crowns are always cool, but if you plan to wear it daily and possibly get it wet (washing hands, caught in a rain storm, etc) you are going to want a fresh new crown on it.