Oops, it's a 101.
I just checked the serial numbers. Mom's sphynx (sp?) is JA710194. a 28K from 1904. The other one I had mislabled as a feather weight is actually a Singer 101 from 1926. (AB095020) I have a really sad singer 66 (AC577585) from 1929. There's a 128 in a lovely wood case (AK974137) from 1952 that sews like a dream, then another odd one, AJ249442 in a more modern case that shows it's from 1949 and is a model 31. Not sure I have that right. The Koch Adler (97847) is a treadle machine, and I just got a cool treadle base, but it's obviously for some other machine. With one piece of wood altered, I'm quite certain I can retro fit it for the Adler.