I was active in shows, conventions, mail order auctions, etc from '72 to '76, and it was not a thing. Got a table at the first national in '80 to sell off my collection and it was an obsession by then, led by the '75 Rice rookie. I had it has part of 100 card common lots, and got so many requests I pulled it and sold it solo.
So I"m guessing somewhere between '76 and '79.
|