Okay yours is the stainless steel version - there is also a titanium version, so I had to be sure which one you had.
The crown part number is 069ST42154.
Anyone with an Omega parts account can get this crown for you, and you may be able to find it on the open market as well - eBay or possibly a watch parts supplier. You could try Cousins in the UK.
Note that you should get a watchmaker to do the installation for you.
Cheers, Al
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