Description:- US 1850 Carriers' stamp 1c. "U.S.P.O PAID 1. CENT." Philadelphia, Pennsylvania. City carrier Department stamps issued by Officials or Employees of the U.S. Government for the purpose of securing or indicating payment of carriers’ fees. 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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