(America's First Carrier Stamp) 1835-36 Northern Liberties News Rooms Carrier stamp. Type I impression of black indicia reading "N.L. News Rooms, Via Sub Post Office, 213 North Third St." on left third of a folded letter postmarked clear red "Phila/20/Mar" octagon, Very Fine and rare, one of only about 15 examples recorded; with 2001 P.F. certificate. Estimate  $3,000 - 4,000. The Northern Liberties Sub Post Office was established by Alexander McMackin in late 1835 and operated for a short time until early 1836 in the Northern Liberties News Room. News editorial in the October 10, 1835 edition of the Saturday Courier mentioned the business of a Sub Post Office and "a new and appropriate stamp…now imprinted upon all letters deposited at his office." Letters deposited by patrons of the News Room were subsequently carried by an employee to the main Philadelphia Post Office (Northern Liberties, an area north of Philadelphia's Vine Street, did not become part of Philadelphia proper until The Consolidation Act of 1854). $0 (Image)