Here is a listing of the old parts number for Ref. 168.005:
https://boley.de/en/case-parts/omega/10537.168-005?q=168.005&p=0&s=50&l=13
Omega has a more modernized method for parts numbering today, but I don't have access to it.
Crown is not original, but that one looks similar to what Omega would use today if they were restoring that particular style. Unfortunately, no one that I know of has a stock of the thin 10-sided crowns to sell. You might find one on eBay, but I would guess that 90%+ are cast imitations.
If it is signed, I would leave it alone.
gatorcpa
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