Vintage equipment identification

[DiveCaptDean]

I dont think most regs of this day( maybe poseidons) will still be functioning 50 years from now..but they are alot more complex now..and i think probably for good reason....still it is very impressive that vintage stuff is still divable..understanding that the diaphram is the main issue with them....but arent they like breathing through as straw at any moderate to deep depth...

also- do any of you have a link the story of the 800ft dive on this reg....was it modified???