my wonderful bf bought me a singer1920[that's the way it was advertised] the serial # is d1134019 the other # i can find .ssau52-16-1.i've already driven poor billy nuts w/questions[he's so GREAT!]it's been wired,so want to take it back to treadle.that makes 3 sewing machines & 1 serger[that i'd LOVE to sell]so think i've done all the "saving"i can afford & have room for !