This is a maximum card with the 8-cent John Sloan postage stamp issued at Lock Haven, Pennsylvania, on August 2, 1971. This was the tenth stamp in the American Painting Series that began in 1961.
The stamp honors American painter John Sloan (1871-1951) and reproduces his painting "The Wake of the Ferry II." The painting is in the Phillips Gallery in Washington, DC. Sloan was a leading figure in the Ashcan School of realist artists and was known for his urban genre paintings of New York City.
I am participating in Sunday Stamps at Viridian's Postcard Blog