Description:- US 1849 Carriers' stamp 2c. "HONOUR’S CITY EXPRESS" Charleston, South Carolina. 4LB1 unused is a unique uncanceled stamp on piece. The used cut-to-shape stamp 1850-52 is also unique. In addition two covers exist bearing No. 4LB1. Semi official local issues exist in the following towns: Baltimore, Boston, Charleston, Louisville, New York and Philadelphia.

Source: catalogue.klaseboer.com/vol1/html/unitesem.htm

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