There are some questions regarding the year of issue for the R315's as well. It may have been issued over several years. I believe that some have proposed here on net54 that the year of issue should be more like 1930 or 1931 for the R315's. You will likely find the post that I'm referring to by searching the website. (I can't do it at the moment.)
The range of years for the postcard-back exhibits raise questions as well. To confirm the year for a particular player, you would have to find the original photo used to make the card and try to track down the year in which that photo was taken. Someone told me that Conlon dated all of his photos. If Foxx's photo is by Conlon, then there must be a date somewhere for that picture. As far as the Grove postcard-back exhibit, I believe that it was a Conlon photo taken in 1928.
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