Lot
13 
Philadelphia, Pa., U.S.P.O. Despatch, 1849-50, 1¢ black on blue, showing full framelines at top and left, tied by blue "Philada., Pa., 5 cts, May 3" cds on 1850 folded letter to New York; stamp with some enamel wear, otherwise Very Fine; with 2001 P.F. certificate. Scott No. 7LB7; $6,500 Estimate $4,000 - 6,000.
ONE OF THREE KNOWN TIED ON COVER EXAMPLES OF THE PHILADELPHIA "BLACK ON BLUE" CARRIER ISSUES AND THE EARLIEST RECORDED USAGE KNOWN.
The Philadelphia "Blue Glazed" carrier department stamp has been recorded from May 3, 1850 until February 19, 1851. It has been confirmed that only 13 genuine on cover usage are known with two in combination with the 1847 issue.