Question about Omega crowns

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Hey All,

I am trying to solve a puzzle about the crown that was on my father's watch. At first, I thought it was a replacement crown, since it is not signed. Then I noticed a few other watches with similar caliber (600's) from around the same time period. This got me thinking that the crown that was on it, is actually original. The first pics are from my Dad's Omega. The next are from an example I have found on ebay. I am trying to keep Dad's watch as original as possible, but the crown has me puzzled. Any help would be greatly appreciated.

Thanks,

Mac5
 
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Sorry. This last photo of Dad's didn't load. Here you go.
 
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Neither watch has an original crown, the second watch also has replaced hands which are incorrect.

I think there are a couple different crowns which are correct for this reference, they would be signed.
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