U.S.P.O., Philadelphia Pa., 1c Black on Blue Glazed (7LB7).
Huge top margin, large at left, trace of bottom frameline, light shade, some slight surface disturbance as usual, uncancelled, used on 1850 folded letter to Smithport Pa., blue "Philada. Pa. 5 cts. Jul. 1" integral-rate circular datestamp, Fine and very scarce (16 reported covers), ex Hessel and Golden, with 2000 P.F. certificate
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