U.S.P.O., Philadelphia Pa., 1c Black on Vermilion Glazed (7LB8).
Full frameline at top, parts of three other framelines, uncancelled, used on folded letter to Burlington N.J., blue "Philada. Pa. 5 May 28" integral-rate circular datestamp and matching "Paid" in frame, fresh and Very Fine, choice example of this very scarce carrier usage (14 reported covers), ex Hessel
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