#17, 12c Black, Horizontal Pair on 1855 Cover to London, Carried by Collins' Line "Atlantic"

Horizontal pair tied by black Philadelphia datestamp on 1855 cover to Stratford, London, with red Philadelphia "Paid 15" exchange marking (May 15) and red London arrival datestamp (28MY28 1855), endorsed “Per S.S. Atlantic via Liverpool,” carried by Collins Line Atlantic from New York. Light edgewear and a tear through right stamp, Fine appearance.