I would go with the 15-90 (external motor). As everyone has already said, you can easly convert it if you want to, but most of all, if something goes wrong with the motor you can easily replace it. With the 15-91 (potted motor) it's not as easy, plus the motor is obsolete, and you would have to find a donor to replace.
Originally Posted by luv2learn
Hello everyone,
It's been a long time since I posted, but I have been reading and watching the great machine parade. Now I have a question. . . If looking at 2 Singer 15 machines:
Condition very good, nothing missing, both worked and were the same price. . . one is a potted motor and one is a belt driven motor, which would be the better choice and why?
Thanx in advance. Brenda