Back in 1976 we did the same crazy pool drills as stated by the OP and I also used the same book for my BASIC Scuba course.
In 1976 our PADI C-cards were laminated cardboard but they did have our photo on them.
Part of my Basic Scuba course in 1976, during an open water dive, the instructor would come from behind turn off our air and remove our masks at the same time. Ah, the good old days!
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