They weren't in the 1937 catalog, but are listed in the 1941 catalog (shown below). I don't have scans/photos of the intervening years, so not sure if 1941 was the first year for them, but that at least gets you in the ballpark.
Edit to add: The Spalding logo used on your ball is an earlier one than the ball pictured on the catalog page I posted. Your logo was used through 1940 on their ONL balls, so I suspect it's at least 1 year earlier than the 1941 ball pictured in the catalog.
Last edited by thecatspajamas; 10-19-2014 at 03:59 PM.
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