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Ron,
The question and my answer has been of concern for some time. I answered the question as I interpreted it.
I never had or took the opportunity to complete a basic SCUBA course; there were very few around, and all poorly subscribed
Like most of that era I obtained my waterman ship via water polo & swimming and by spending every available waking moment free diving or surfing, diving experience by annihilating every thing that swam or crawled in the ocean, my academic training by studying the USN Dive manual, Clinical Symposia, Underwater edition for the medical aspects and books by the God of underwater of that era Hans Hass. (Who FYI did every thing 10 years earlier and 10 times better than JYC)
I progressed from an active recreational diver to a card carrying instructor almost fifty years ago by completing the very demanding and certainly prestigious LA county Underwater Instructor program; at that junction in history it was the only available civilian dive training program. (LA County types are "Underwater instructors" - the term SCUBA was not in common usage in 1954)
So that is why I said I was never certified, and indeed I wasn't as a basic diver--only at the instructor level.
Suggest that you might want to read my post of about a month ago about Harry Vetter, LA Co Instructor and NAUI instructor #4
sdm