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davidcyclebackT206s are lithographs, and lithograph plates rarely lasted over the years, typically having the surfaces being wiped clean for other use. I doubt a lithography plate would be usable 40 years after. I've never seen printing plates for early lithography issues, like Allen & Ginters, T206s and Goudeys. I've never even seen a 1950s-80s Topps lithography printing plate-- and you see Topps proofs, original art, uncut card sheets, player contracts and other productions items all the time. If no one here has seen a printing plate for 1989 Upper Deck, 1992 Bowman or 1980 Topps, the T206 Wagner plate floating around sounds like a fairy tale. You do see single player litho plate pieces for late 1990s/2000s cards, but that's because Donruss/Topps et al used/use them as inerts in packs. Not a bad idea-- instead of destroying the plates, cut them up, slab on a sticker call them 1-of-1 inserts.
Old commercial printing plates exist, but they are almost always for non-lithographic cards like Exhibit Supply, Sporting News and newspaper pictures. These are the 'embossed' printing plates where you can feel the image with your finger. If you found an undamaged Exhibit Supply or Sporting News printing plate, you could make more cards from it.