John Krider & Co. Gun Makers & Dealers in Fishing Tackle, blue illustrated corner card showing Rifle, Hunting Dog and Fishing Gear in blue on attractive cover to Harrisburg Pa., franked with 1861 1¢ blue, horizontal strip of three (natural s.e. at right, rich color) and tied by "Philadelphia Pa. Sep. 4, 1861" cds, Extremely Fine and choice, a rare early gun advertising cover, especially attractive as this is a very early usage and the advertising color is similar to that of the stamps, ex-Knapp. Estimate  $1,000 - 1,500. $0 (Image)