Is this a monocoque? I can't find any notches.

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Look here with loupe probably find a little notch somewhere
 
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The notch should be on the right hand side, see the fat arrow above. It is tiny. Sometimes the case back is put on turned 180 degrees which results in the crown hiding the notch but it looks correct here.
 
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nice ! watch, worth any professional service 👍 Where are you located?