And, by the way, my NAUI card says Advanced Diver and forgoes mentioning open water. In 1972 I do not think they thought much about having to state open water on the card.
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The old NAUI "Advanced Diver" is VERY different from the current NAUI "Advanced Scuba Diver" (NAUI doesn't say "Open Water" in any of its courses now). . The old NAUI "Advanced Diver" program was the third course up from the entry level "Basic Diver" certification way back then and was more "advanced" than the current "Advanced Diver" course. The old NAUI training progression was: "Basic Diver", "Open Water Diver", "Advanced Diver" and then "Master Scuba Diver."