Copyright dates
Mungo, Bartell and Dickey were in earlier series and info was used again except for the updated stats. They previously published those three so it makes sense that they repeated the original copyright dates.
You'll notice that on any of the many back variations using the same card numbers, none of them are the result of different copyright dates. They were consistent as to the original year of copyright even when they re-issued cards with updates stats or different numbers.
Bartell is a little different in that the "P" on his jersey got rubbed out on a second version of card #15 and his bio picks up that he went from the Phillies to the Giants.
Fun to look at this stuff again after they've been out for 80 plus years.
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