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Jay MillerJust spent about a half hour on the phone talking to Peter and I must say that he makes a compelling arguement that the proofs are period. Although some of the proofs may have been attached to the cardboard some time after the 1880s (they were sitting unbacked in files and were becoming damaged)the actual proofs he contends are period. The source--the relatives of a photographer for Goodwin--can't get much better than that. He also notes that proofs of Matthews are very rare. He promised to post some more information of the board so I anxiously await what he has.