We can take unlilmited examples, but I tried, here, to focuse on the Fifties Diving Watches, which can be considered as the (re ? ) birth of these special timekeepers, as Panerai could well be considered as a Pioneer regarding this topic ( Since 1936 ).
At this moment, which were the more known brands to tempt this aventure?
Rolex and Blancpain, since 1953, and also, a bit later, Omega ( 1957 ) and Jaeger- LeCoultre ( 1959 ).
Hence the idea to take a Family Picture of what I consider as 4 aces:
From Left to Right:
Rolex Submariner 5508, Omega Seamaster 300 Ref 14 755, Blancpain Fifty Fathoms Milspec, and Jaeger-LeCoultre Deep Sea Alarm ( Europe ) :
Is it possible to beat or upgrade these 4 aces?
Of course, it would be exciting to get a 5510 or a 6538 instead of the Rolex 5508, and to trade the Seamaster 300 Ref 14 755 ( which replaced the CK 2913 ) for this last one .
As for the Jaeger-LeCoultre, this Deep Sea Al;arm is impossible to beat, and the Fifty Fathoms Milspec is an absolute Reference, which was used as a basis for the further Tornek Rayville, US Navy, and so on.
But, as they are, they are very representative of the 50ies Diving Watches, they were the Champions of their respective brands.