2c Black, Die I, Large Die Proof on India, Vermilion "Specimen" Ovpt. (73P1S). Mounted on 153 x 228mm card, green "Specimen Postage Stamp from the National Bank Note Company No. 1 Wall Street New York" at bottom of card, trivial edgewear, Very Fine, very rare, from National Bank Note Co. sample book, the Die I large die proof is exceedingly rare -- none were offered in major Black Jack sales, except with the "Specimen" overprint as offered here

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