I'm pretty sure the Dodgers logo was around in that configuration at least 1951 or 1952, same for the Giants on there. The Phillies one is an odd-ball - it shows the Blue Jay which was only used from 43-45 (why they changed their name to the Blue Jays but kept the Phillies name also is one of those unsolvable mysteries...). The Reds logo looks like a 30's-40's version as well.
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