1850 (Feb. 18) Philadelphia, Pa. to London, England, blue folded letter with blue "Philada Pa. Feb 18" cds and red "Phila. Paid 24cts." rating octagon h.s., New York red "19" credit h.s. to G.B., carried by Cunard Line Europa from New York Feb. 20 to Liverpool arriving Mar. 4, London (3.4) arrival d.s., Very Fine, This is the earliest recorded use of the new Philadelphia octagonal rate handstamp showing 24¢ prepayment for treaty rate. Estimate  $200 - 300. The Philadelphia 24¢ octagonal rate handstamp was in use at Philadelphia until March 1853. $0 (Image)