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boxingcardmanI can add a few points:
There are four boxers. The Joe Louis and Primo Carnera are available with the square corners and are easily located. The Marcel Cerdan and Jake La Motta are not and are difficult to find.
SGC used to grade the square cornered cards. I had an SGC 92 square Louis.
Some of the cards were issued in a square cornered perforated edge format in boxes. These have movie stars on one side and athletes on the other side. Here is a scan:
