Panerai is Panerai since the invention its box 1950 with its "crown guard" system before the SLC, the 3646 or as want to call, were not more than a instrument watch, with a common design at the time and a borrowed machine that really is what to you becomes crazy, ROLEX.
I like Panerai and divers of the Italian Navy, Marina Militare, would love to wear on their wrists a 'Gulf Regatta" PAM526 or Submersible model current.
I apologize but I love this brand so much as you do; I really like historic watches its meaning and the latest models that respect the memory of their predecessors.