Lot 58 P
1851, 1s Black, Plate Proof on Card, Overprinted "Specimen", vertical pair with partial overprint, margins all around; some trivial light toning, still Very Fine, ex-Argenti, Koh. SG No. 7 var.Scott No. 7TC4S Estimate $750 - 1,000.
THE ONLY RECORDED 1851 1S BLACK PLATE PROOF ON CARD "SPECIMEN" PAIR, ONLY TWO OTHER SINGLES SHOWING THE OVERPRINT ARE RECORDED.