black double oval handstamp on horizontal pair of 1857 3c Dull red with "Philadelphia Pa Aug 18" octagonal postmark alongside, on small folded cover to New York City, manuscript docketing ties stamps, vertical file fold through left stamp, cover slightly reduced at left, very fine, a rare use of this carrier marking, ex-Chapman, Gibson, Emerson, and Cipolla, 2015 Philatelic Foundation certificate