Question about Malta's Guide to Louisville Slugger Bats”
Rare book question: in the players' bat chart section, some of the older entries read as this one does:
Bresnahan, Roger....
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File card: His Old Bresnahan 5/20/1911; Model B69, 34"; caliper only
Me: I'm wondering what the phrase "caliper only" means in this context. Any guidance would be appreciated.
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