The 6-cent stamp commemorating the 1fiftyth anniversary of Maine Statehood was first placed on sale on July 9, 1970, at Portland, the state's first capital. The stamp depicts a painting entitled "The Lighthouse at Two Lights" by Edward Hopper. The lighthouse portrayed in the painting is located at Cape Elizabeth in Maine. The painting currently hangs in the Metropolitan Museum of Art in New York City.
The stamp was designed by Stevan Dohanos and was issued in panes of fifty, with an initial printing of 130 million.
Postal Bulletin (June 4, 1970).
The Metropolitan Museum of Art. "Works of Art." http://www.metmuseum.org/works_of_art/collection_database/modern_art/The_Lighthouse_at_Two_Lights/viewObject.aspx?&OID=210009492&PgSz=1.