3c Purple, Michigan Centenary, Progressive Large Die Proof on Card (775-E1). 62 x 47mm showing layout lines outside the design, incomplete design most obvious in the top label which is missing "Michigan", other features of the final engraving also incomplete incl. parts of background and "Centenary", couple inconsequential toning specks outside the design, Very Fine and probably unique, unlisted in Scott, this originates from the estate of the engraver, Leo C. Kauffmann, and has never before appeared on the market, we have assigned it No. 775-E1

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