Vintage Monocoque Seamaster ID: Pre-DeVille Ref 166.020

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Looking to identify my grandfathers old watch. I know i will need the serial to be sure but I have not seen a monocoque case seamaster with this type of crown before.

To me it looks like a Deville but I believe it is pre 1967 and I don't have the ability to open a monocoque case at home.
 
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Possibly a reference 166.020, other members will have more knowledge than me on these models.
 
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It’s a pre-DeVille with an incorrect crown. Likely around 61-62.