Thank you, gentlemen for your input. Ozymandia is correct. After scrapping off debris, ect. there is a round tag on the back of tc. says: New Process Gear: 273 D, Ass'y # 52123? 25AB, Serial #: 12-22 09-3, ratio: 272, made in Syracuse, New York. Still, don't know what make. I'm guessing...