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Tim NewcombProbably Paul read about the 1937 date for R314C from my article on the Fine/Wide Pen sets in two recent issues of Old Cardboard. If you're interested in these sets at all, it should be pretty helpful. The Canadian origin of the "creamy" Wide Pen set is pretty well established.
That being said, I would probably argue for the R314C as Feller's rookie issue unless, as someone remarked, you are dead against considering premiums as cards. I don't see why they shouldn't be, but everyone can call that as they see it.