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DavidLithographic (T206, Goudey, Allen & Ginter, Topps, etc) plates were usually 'wiped clean' when finished weren't designed to last forever. Photengraving plates(Just So, Sporting Life, Sporting News, etc) would last if kept. I've seen a number of newspaper releif plates from the 19th century with baseball subjects that are still around-- so there's no reason a few old card plates wouldn't exist, other than the printers' closets were getting full.