Someone reading this must have a green bezel...don’t be shy, now.
Finally got around to change the plexi on this]
Lovely. What is the reference? Small diameter right?
Yes, the bayonet patent is very rare and unusual. I have encountered 100+
of those faceted cases from different makers. But never seen one bayonet IRL. Here you can see it refered to as «brevete 1008» in a watchmakers handbook from 1948
@bgrisso