Adding to the mystery of the background of R-310's, this communication (from 1972) between pioneer collectors Buck Barker and Bill Weiss adds some info. Buck remembers them being associated with Baby Ruth Gum and were distributed at the individual stores where he grew up in St Louis, while Bill obtained his from an employee of the printing company in Chicago.
Baby Ruth Gum was produced by Curtiss Candy, which also made Butterfinger and Baby Ruth Candy bars, so maybe a more appropriate issuer would be R-310 Curtiss Candy ?
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