U.S.P.O., Philadelphia Pa., 1c Black on Vermilion Glazed (7LB8).
Large top margin, trace of frameline at right, slightly creased at corner, uncancelled, used on 1850 folded letter to Cross Roads Pa., partly readable strike of blue "Philada. Pa. 5 cts. Feb. 11" integral-rate circular datestamp, a bit toned and spotted, otherwise Fine, very scarce (14 reported covers), ex Green and Gibson
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