Hackney & Bolte Penny Post, 1886 (1¢) Black on Red, in combination with 2¢ red brown (210) on cover to Philadelphia, Pa., both tied by "Atlantic City, N.J., Jun. 30, 1887" duplex postmark, receiving backstamp; trivial small cover crease at top left, Very Fine; signed G. Sloane, with 2002 P.F. certificate. Scott No. 153L1  $4,500. A GREAT ON COVER RARITY, THIS BEING ONE OF TWO ON COVER USAGES KNOWN MAILED ON THE SAME DAY, A THIRD USAGE TIED ON A POSTAL CARD IS ALSO KNOWN. $0 (Image)