Looks like Official Ohio State League? Not sure what year unless you can make out a president's stamp, most likely on the side panel to the right of the OSL stamping. Broad range should be somewhere between 1935 and 1947. Pretty cool, as you don't see many "Class D" minor league balls from that era (or any vintage era) as most teams were strapped for cash and wore the equipment out/didn't keep many spares on hand.
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