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Brian H (misunderestimated)I haven't really looked into it. But when I went to sell my R315 (listed as 1928) of Earl Averill (which showed him in the majors with an Indians uniform) I discovered that he only played his first major league game in 1929. In fact he was still in teh Pacific Coast league that season (he has a zeenut card). I would surmize that this puts the to R315 sets (A and B)in 1929 or later.
I haven't checked into any of the other players in the
http://members.aol.com/METSBWD/hofers.html
http://www.baseballreference.com/a/averiea01.shtml