U.S.P.O., Philadelphia Pa., 1c Gold on Black Glazed (7LB11).
Full margins, usual faint wrinkles, tied by two strikes of blue "Philada. Pa. 10 May 5" integral-rate circular datestamp on small neat cover to Cincinnati, Extremely Fine, one of the rarest tied uses among the carrier issues, ex Seybold, Knapp and Meyersburg, with 1997 P.F. certificate
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