A few months after its founding, the City Despatch Post was sold to the U.S. Government, which renamed it the "United States City Despatch Post." The government began operation of this local post on August 16, 1842, under an Act of Congress of some years earlier that authorized local delivery. Greig, retained by the Post Office to run the service, kept the firm's original Washington stamp in use, but soon had its lettering altered to reflect the name change. In its revised form, this issue accordingly became the first postage stamp produced under the auspices of a government in the western hemisphere.