After looking here, The Plow Guy - Identify Your John Deere Plow , it looks like a #52 Tractor Plow. "The standard duty 2 bottom clutch lift trailer plow made from 1935-1945. Beam number 612 & 613. It was available in 12, 14, and 16 inch widths." The link has a lot of good info. Hope this helps. Mark.