I loved my At-Pac! I may have posted this photo before, but here I am in 1979 at Casino Point in Avalon on Catalina Island wearing my At-Pac and suffering from "emblem"-ism. Mark.
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"The diver who collects specimens of underwater life has fun and becomes a keen underwater observer. .. seek slow-moving or attached organisms such as corals, starfish, or shelled creatures." (Golden Guide to Scuba Diving, 1968)