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Al SimeonePM,PX,PE,PB,PR,P, are all catalogue designations for the various pins. P is for pin the second letter is more of a mystery. PB is for (pins bread)Kolbs,Mrs Sherlocks, P or P1 is for cameo pepsin the first pin set.P2 sweet caporal. PE (pin early) ornate frames. PX Domino Discs, Double Header, PR cracker jack,orbit PM PM10 stadium pins, PM15 yellow basepath,PM8 our national game. The american card catalogue was the first I believe to assign them these letters and numbers but some make no sense.