Set Summary
Issued around 1933 by Gum, Inc. of Philadelphia
Player images printed on solid color metal disks
Player name, team printed at bottom of disk
"1" or "2" inside circle printed at very bottom of pin
Designed so the "1" and "2" sides formed 2-sided coin
Colors include white, red, green, yellow and blue
500 players promised on wrapper; only 43 known in hobby
PX3 designation first used in Sports Collector's Bible
Reference:
1) "Set Profile: 1933 PX3 Buttons," Old Cardboard eNewsletter, Issue #135 (July 2015), Item #2
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