"Wells, Fargo & Co., Agent of Pony Express", type 2 frank on 10c Green Pumpkin entire (U40), "Philadelphia Pa Aug 26 1861" octagonal datestamp with dotted gird one of just two Pony Express covers originating in Philadelphia FKW Census #W53 2022 Philatelic Foundation certificate Provenance: Thurston Twigg-Smith (R.A. Siegel Sale 979, 2009)