[Scott Garner]

I would also throw Dr. CG Steen into this category.
Somewhere on net54 there is a terrific entire thread on Dr. Steen, who was a dentist that, during the 1930's and early 1940's, would write to players asking for them to sign a Baseball Magazine supplement featuring the player.
Here is my Vandy response letter and signed supplement, that I own thanks to others on net54.

I can't imagine a conversation about collecting autographs without mentioning Jeff Morey, that I believe is still alive. Definitely an autograph pioneer and he is the author of a publication called The Autograph Review on collecting autographs. He amassed one of the largest collections in the hobby before selling it a number of years ago.

BTW, Jim Stinson would be a great one to answer this question, if we could get him to weigh in.