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Todd SchultzAgree that they are likely team issued. They're too big for Jay pubs, and too early. Jay Pub team sets did not have that many players for each team like your Orioles, either.
You might try writing Bob Lemke at SCD. Back when I subscribed there was a column for newly discovered or uncatalogued issues that he would write, "Std catalog update" or something, where readers would write in with their info. He's also active in seeking info about uncatalogued sets for the big book, so he'd probably like to hear from you. He posts here periodically.