U.S.P.O., Philadelphia Pa., 1c Black on Blue Glazed (7LB7).
Large margins with framelines mostly complete, as usual a few rubbed spots in surface coloring, tied
at the bottom left corner by blue "Philada. Pa. 5 cts. Jan. 13" integral-rate circular datestamp on ca. 1850-51 folded cover to Burlington N.J.
VERY FINE. AN EXTREMELY RARE EXAMPLE OF THE BLUE CARRIER STAMP TIED ON COVER.
Only 16 covers with the Blue stamp are reported. Ex Caspary and Boker.
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