New Insight into 1928 F50 Sweetman Card Set and Company?

The F50 designation has been assigned to four 1928 baseball card sets in the pre-war era – Yuengling Ice Cream, Tharp’s Ice Cream, Harrington’s Ice Cream, and a fourth manufacturer called the Sweetman Company. Regarding that last company, it has been a mystery as to what they produced. The other three sets of cards were made by ice cream companies.
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