U.S.P.O., Philadelphia Pa., 1c Black on Rose (7LB6).
Large margins with framelines almost complete all around, uncancelled, used on greenish blue 1850 folded letter to Burlington N.J., blue "Philada. Pa. 5 cts. Jan. 3" integral-rate circular datestamp, fresh and Extremely Fine, rare (10 reported covers), ex Hessel
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