You definitely have the scarcity thing right. It's also believed that some of the Salutations (1939-1946) were printed with the 1947-1966 cards as well like Williams and DiMaggio. As for PSA.....not sure you can fully count on the SMR being remotely correct on anything other than directionally usable. Just my personal opinion. Not sure how PSA identifies the variations of the exhibits. There are a lot of nuances between them that I'd bet aren't completely identified correctly. Same kind of stuff like T206 back variations and other specifics about individual sets that are difficult to fully appreciate.
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