Looking for some feedback I an assumption I am making regarding Universal Geneve Polerouter Sub crown variations. From what I can tell, there seems to have been 2 distinct styles used between the different cases.
Style 1:
The Rounded Crown - approx. 6.75mm
It seems as though the Rounded Crowns were used on earlier versions of the Sub (37mm), and had a tube & flange similar to Calypsomatic for the crown to screw-down:
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