The Keystone Manufacturing Company was incorporated in Boston, MA in 1919 by Edward M. Swartz, Isidore Marks, Benjamin Marks, and J.M. Weisman. They manufactured 16mm and 8mm cameras and projectors, as well as metal and wooden toys. In 1936, they launched the Keystone Model A-7, a 16mm spring-motor driven camera that operates at seven speeds including 8 fps, 16 fps, and slow motion. This unit comes complete with a Cooke Anastigmat 1in f2.7 lens. This camera has been cleaned and serviced.