Originally Posted by Annaquilts
Singer 15-91 direct drive (no belt) is electric and the 15-88, 15-89, 15-90 have belts and are threadles or can be threadled. Some might have a potted motor.
Those are beautiful! I badly want a 201 and a 9W to add to my collection. I have a 27-4 (treadle), 15-91, 15-96 (treadle), 66-1 (treadle), and a 66-16, none of them in cabinets as beautiful as yours. I heard that back then people loved the 15-91 so much but wanted it in a treadle so they made the 15-96!