Quote:
Originally Posted by MK
The PM designation came from the American card catalog originally published by Burdick and later revised by Buck Barker. I don't think the P and the M stand for anything, they are just used to designate different types of collectibles. PM 10 were definitely those pins sold by vendors outside stadiums.
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I found this in a post by David Hornish. It doesn't provide the definition of the PM acronym either.
http://www.oldbaseball.com/refs/typecards.html
http://www.oldbaseball.com/refs/typecards.txt
40s-60s PM 10 STADIUM PHOTO ISSUE-PIN
40s-60s PM 10 STADIUM PHOTO ISSUE-PIN COLORED BACKGROUND
40s-60s PM 10 STADIUM PHOTO ISSUE-PIN COLOR PHOTO
40s-60s PM 10 STADIUM PHOTO ISSUE-PIN BLACK BORDER
40s-60s PM 10 STADIUM PHOTO ISSUE-PIN GREEN BORDER
40s-60s PM 10 STADIUM PHOTO ISSUE-PIN RED BORDER
40s-60s PM 10 STADIUM PHOTO ISSUE-PIN WHITE BORDER
40s-60s PM 10 STADIUM PHOTO ISSUE-PIN WHITE BORDER-TEAM NAME ON TOP