2c Black, Die I, Large Die Proof on India, "Specimen" Ovpt. (73P1 var). Mounted on 92 x 134mm card with red "SPECIMEN" overprint across stamp and full imprint in red at bottom, from a National Bank Note Co. sample book, Very Fine, 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, ex Burrows, Scott Retail as normal

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