Anyone ever seen one of these before?
Made by R.M. Hollingshead corporation in Camden NJ. Interestingly, Hollingshead invented and patented the Drive-In theater in 1933:
http://en.wikipedia.org/wiki/Drive-in_theater "The drive-in theater was the creation of Camden, New Jersey, chemical company magnate Richard M. Hollingshead, Jr., whose family owned and operated the R.M. Hollingshead Corporation chemical plant in Camden. In 1932, Hollingshead conducted outdoor theater tests in his driveway at 212 Thomas Avenue in Camden. After nailing a screen to trees in his backyard, he set a 1928 Kodak projector on the hood of his car and put a radio behind the screen, testing different sound levels with his car windows down and up. Blocks under vehicles in the driveway enabled him to determine the size and spacing of ramps so all automobiles could have a clear view of the screen. Following these experiments, he applied August 6, 1932 for a patent of his invention, and he was given U.S. Patent 1,909,537 on May 16, 1933"