I have a 1936 Singer 201 treadle machine; its a very quiet,smooth running machine. One of Singer's best. It has a drop in bobbin,rotary hook, takes class 66 bobbins & modern needles. The machine came in 4 configurations:201-2 has a potted motor, direct drive no belt needed, 201-3 is belt driven and has a motor attached to the rear of the machine, 201-1 is a treadle, 201-4 is a hand cranked machine(this is what my machine was originally).
Sharon W.