It's not a Singer, it's an Altenburg. Singer is a brand name, as is Altenburg. As far as I know, Singer is the only company to manufacture 15's. After WWII, there were copies of the machine made in Japan, and are referred to as 15 clones. The model 15 was manufactured by Singer for many years. At various times, it was available as a hand crank, a treadle, with a belt driven motor and a direct drive motor. I'm not familiar with all the suffixes for Singer15 models, but the ones I have are 15-91's. They have a direct drive motors that are referred to as "potted motors".
Welcome to the board. We love old sewing machines, saving them, using them and working on them.
bkay
Last edited by bkay; 12-31-2019 at 07:24 AM.
Reason: spacing