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Scott ElkinsFamous and Barr and Blank backs. The card is an M101-5, not an M101-4, and is NOT found with a Sporting News back, as the Mastro description claims. The description even claims the Thorpe is most commonly found with a Sporting News back - not so, it does NOT even exist with a Sporting News back period!
As for the most common back for a Thorpe, personally, I have seen more Thorpes with Famous & Barr ad backs than I have seen with blank backs over the years. So, while it is impossible to determine which is more common (blank or Famous & Barr), my experience coincides with Jay's that the Famous & Barr add is more common (again, this is from my experience of the Thorpes I have seen). The one thing I can be certain is that the description in Mastro is incorrect, as Thorpe CANNOT be found with a Sporting News back.