FWIW, Old Cardboard has an
M116 reference checklist that includes rarity. It looks to have been updated to include the F. Smith (Bos) which ranks an 8 on their rarity scale. Bates (Cinn) and Seymour (Balt) the other two of the 3 cards at that level.
Surprisingly, there are also 3 cards at a 9: Beck and Lobert (Phillies) and H. Lord (WhiteSox). Not sure how those rates are determined.
Regardless, great find, Mac!!
--
Mike