The inner caseback says
Metal Chrome
Fond Acier
Inoxydable
That speaks for a 3. And even if double stamped, that was not uncommon. You know that best.
Bezel and crown: Crowns are replacement parts. Nobody cared about crowns in the 50ies, 60ies or 70ies when servicing a watch.
May be the bezel was damaged and someone wanted a duotone case. Who knows what happened during the past 70 years?
Is car tuning for you ripping off the uninformed?
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