U.S.P.O., Philadelphia Pa., 1c Black on Vermilion Glazed (7LB8).
Bottom right corner position with two full framelines, uncancelled, used on blue folded cover to Burlington N.J., blue "Philada. Pa. 5 cts. Aug. 8" (ca. 1850) integral-rate circular datestamp, fresh and Very Fine, choice example of this very scarce carrier usage (20-22 covers reported by Lyons), ex Caspary and Boker, with 1993 Jakubek certificate
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