"A recent find of many of these SQUARE cards (BB and Movie Stars) suggest a 1949 issue date since Walker Cooper is depicted in this col-
lection as a NY Giant (Cooper was traded to Cinci in the Summer of '49)"
Actually, what it proves is that the manufacturer used a photo taken before the trade, not the timing of the card manufacture itself. Had he been in a Reds uni it would prove a manufacturing date no earlier than the date of the trade. It is just like taking a photo with a newspaper in it to prove the date--doesn't prove the photo wasn't created later but definitely shows the earliest possible date of creation.
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