Another one for the SABR blog. Really amazed by what I found when I looked at the 1939-40 Play Ball sets side-by-side.

SABR's Baseball Cards Research Committee

Author’s note: I suspect what I’m presenting here must have been obvious to the collectors of the day. However, any record of it seems to have gone unpublished. I am hopeful that I am sharing something new and interesting to our readership, but feel free to let me know in the comments if this is more “knew” than “new!”

My previous Cardboard Crosswalk examined the 1941 Play Ball set’s connections to its 1940 predecessor. As I researched and wrote the piece, it was only a passing thought that the 1939 debut offering would contribute anything essential to the story, so I was happy to save the 10+ hours of work any deeper look would provide. It certainly didn’t occur to me that the connection between the 1939 and 1940 set might be the single most unusual and interesting connection between any two baseball card sets ever produced.

Here, then, is…

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