U.S.P.O., Philadelphia Pa., 1c Black on Blue Glazed (7LB7).
Large bottom margin, framelines at top and right, corner crease with usual slightly rubbed surface coloring, uncancelled, used on 1850 blue folded letter to Alexandria Va., lightly struck blue "Philada. Pa. 5 cts. Jul. 6" integral-rate circular datestamp, minor staining along top, otherwise Fine, scarce (17 reported covers), ex Caspary and Hall
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