Can't identify Grandfathers seamaster de ville

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Old watch from grandfather. Know it is missing swiss part on face, and band isn't original. Can someone help identify it, if it is even a real omega
 
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Yes it's a real Omega unfortunately the dial has been poorly refinished.
 
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It could be a ref. 166.020 and I assume it slso has the wrong crown.

Here is how it should look like:



And the inside of the case before service: