When the postal service was first organized and the delivery of mail was only from one post office to another post office and not directly to the addressee. This created the need for private mail carriers.
In the United States, this specialized category of stamps existed mainly from 1842 to 1860.
- A Baltimore Carriers' Stamp
- UNIQUE P.O. STAMP TURNS UP.; Only "Carriers" Stamp of Its Kind Extant and Worth Hundreds of Dollars
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