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VERY FINE ON-COVER EXAMPLE OF THE PHILADELPHIA U.S.P.O. DESPATCH CARRIER STAMP ON THE SHEET MARGIN OF THE ONE-CENT 1851 ISSUE.
The Philadelphia carrier stamps printed on the sheet selvage of imperforate 1c 1851 stamps hold a unique position in United States philately. Elsewhere in the world there are very few instances in which sheet selvage was used to produce adhesive stamps -- the Emory Va. Confederate provisional and early stamps of Zanzibar come to mind as other examples. Two handstamps were used to create the Philadelphia carrier stamps: the Eagle oval (Scott type C31), which produced 7LB16, and the large oval (type C32), from which 7LB18 was made. These were probably necessary after supplies of the Eagle Carrier ran out in 1856. (Image)