Al,
Took me awhile to find the pins in question. What I have realized is all the pins are of Reds players. Yours, mine, and another one held by a third person. Perhaps just a coincidence that only Reds pins have surfaced, but probably not. The Reds were NL Champions in 1939 and 1940. These dates correspond to when the players on these pins played for the Reds. Perhaps they were issued in association with the team's success in that time period. In any event, your question has prompted me to conclude there is an older starting point in the history for the large PM10 pins.
Ciao,
Paul
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