Who sold the first divers' watch with a uni-directional bezel, was it indeed Blancpain or an affiliate?

Dec 22, 2024,22:44 PM
 


And is it also true that Submariners couldn't have a un-directional bezel until like 1979, or the early 80s, because of Blancpain's patent? 

I am not asking anything about the 1953 or 54 dates, just curious who sold the first divers' watch with a unidirectional bezel.



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That's my understanding.... had a 1978 5513 Sub with bezel that rotated in either direction

 
By: j.jota : December 22nd, 2024-23:10
and the 1665 Sea Dweller (a true diving watch), also had a bi-directional bezel. As long as the bezel didn't bump into anything while submerged you'd be ok from a timing standpoint, I guess.

That's what the Internet seems to think too...

 
By: K-Lo : December 22nd, 2024-23:44
Okay, so was there any divers' watch in the 1970s with a uni-directional bezel? Fifty Fathoms were still sold then right? Were those not uni-directional from that time? Also, was it the Blancpain patent that stopped Rolex from putting a uni-directional be... 

Possibly... that might explain why every diver of the time period that I can think of, such as Omega Seamaster 300, was bi-directional

 
By: j.jota : December 23rd, 2024-00:36
The only uni-directional that comes to mind was the Omega Ploprof, with an odd (unique?) design to keep the bezel from moving around once it is set. Of course, you'll never read on this topic from someone like noted BP hater Jose Pereztroika (Perezcope). ...