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Peter ThomasI also bought the leaf cards in packs and wondered why they had different dates. It seems that they simply copyrighted some of the cards in late 48 after the 1948 season and used that date on those cards. They used the 1949 date on cards that were copyrighted in early 1949 before the 1949 season.
Each card is only found with one date either 1948 or 1949 depending on the card.