Here is a close-up of the crown:
View attachment 171415
Looks like an original Omega waterproof crown to me. Unfortunately, the gold plating is shot. What I don't know is whether this crown is original to this watch.
The symbol in the middle looks like an example of the "Naiad" crown. It was a failed experiment by Omega.
https://omegaforums.net/threads/naiad-crowns-info.2435/
Dial on this watch is killer, but the case has been heavily polished. That's likely what killed this crown.
Hope this helps,
gatorcpa
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