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fkwPeter, you might want to update your info
Both the M101-4 and M101-5 are proven to now come from 1916. The M101-5 is from early 1916 (sold for $1 in ads in the Sporting News), and the M101-4 (updated version) is from Aug 1916 (ads first show up in Aug, ordered in series of 20 for 10 cents, or the complete set for a $2 subscription). The 1915 date is old info that is wrong.
If you look through old posts this subject has been brought up quite a few times and all the facts are in these old posts.