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CatI always believed that the production years were 1916, 1917 and 1921. Also, I thought the ACC numbers were in sequential and chronological order (1916=D350-1, 1917=D350-2, 1921=D350-3).
I only have the 2006 Standard Catalog but that is the way that Lemke lists them as well. Or should I say: since Lemke lists them that way that is what I believe.
I only have one, which is graded by SGC, and they did not list an ACC #. Although it states 1915, I believe, like the M101-5s, the accepted print cycle date is 1916.