That was commonly called the C-20 and the longer model per Steve's reply. The came in steel moldboard, cast moldboard, and cast moldboard. I have one of each. The steel moldboard one has a rare gauge wheel attachment. Yours looks like it has Plow Chief bottoms and a single arm concave coulter. They had small point fast hitch prongs to fit the Farmall Super C, 200, and 230 tractors.