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Blancpain

Don't know why I am back here but it seems like (from the internet resources anyways) that the first Rolex Submariners to use a uni-directional bezel was in 1979 or the early 80s

 

more than 20 years after the Blancpain patent in 1954 for a uni-directional bezel (which it's argued, probably to good measure, to be used for specifically for diving).

 
I am not saying the Fifty Fathoms was the first "modern divers' watch" (how do you define that anyways? unidirectional diving bezel? locking crown? I don't know honestly), but it does seem Blancpain's uni-directional bezel patent from 1954 may have stopped Rolex from putting a uni-directional bezel in the Submariner until 1979, or the early 80s. It seems up until 1979, or the early 80s, the Rolex Submariner's bezel rotated both ways (in other words, bi-directional and not uni-directional).

Does that mean the Fifty Fathoms really wins? I don't know, but it does seem like the Fifty Fathoms was the first divers' watch that could have used a uni-directional bezel for diving. But as I read prior posts, its seems the early Fifty Fathoms didn't even have a uni-direcitional bezel? Like you pushed down and it could rotate both ways? Interesting if that's the case.
 
There may be some saying that someone at Blancpain, or associated with Blancpain, took the idea from the Turn-O-Graph (uni-directional bezel), and used it specifically for diving. Could be, maybe I didn't read enough of peoples' research but if the timing is right, maybe someone at Blancpain (or associated) said "hey look at this, we can apply it specifically to diving."
 
Either way, Blancpain was awarded the patent and seemed to have stopped Rolex, and probably Omega too, from putting a uni-directional bezel in a divers' watch. Maybe it's like patent law in the US, it's the first to file a patent application, not necessarily the first to invent, to a certain extent. But maybe let's not get all into it with patent law specifically, you'll put me out of a job.

Not trying to start any fist fights here, maybe there is a boxing forum for that, just stating what I think are mostly facts. 

But as others may have stated, if the early Fifty Fathoms didn't have a uni-directional bezel, when was the first divers' watch to have a uni-directional bezel? Was it the Sub in 1979 or the early 80s, if that's the case maybe the Sub was the first released divers' watch to have a uni-directional bezel? This part I don't have enough facts on.

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