Yes, it should be very comparable bk. All the 15-91 has the revers lever (I think you mentioned it in the other thread if I remember correctly), and the only difference should be the decor on the chromed plates. By 1950 it was usually a pin striped decor, ealier models had grape wines, art nouveau knots, and what not. The gold decals might differ slightly but tends to be rather minimal from the 1930s and up. As far as I now, modes 15-91 with the potted motor never went through much alternations or improvements as long as it was in production. If you are fairly sure you remember it having reverse lever and no motor belt this is the sub-model.
Last edited by Mickey2; 04-05-2016 at 01:39 PM.