Sorry, it was probably my PM this morning that confused you! If I understand correctly, the Singer 201-2 has a potted motor and the Singer 201-3, or 201K has a belt driven motor. The Singer 201-1 is a treadle. I think they are kind of rare though (???) Maybe I'm wrong. I also don't think that the year made has anything to do with the model number. (Please some one correct me if I am wrong here. This is the info I found after a quick Google search.)
Just like the Singer 15-88 is a treadle, the Singer 15-90 has a belt driven motor and the Singer 15-91 has a potted motor. I hope I'm not confusing you more!
Last edited by NZquilter; 08-07-2017 at 06:48 AM.