Late 50s/early 60s - oh and I know! And of course. She loved to sew/knit/crochet/etc - my sister also does and she is taking her unfinished projects and a lot of things, we literally have 4 garbage bags of yarn and other stuff we are giving to a nonprofit who is ecstatic. But it’s a nice machine

PS - I love the fact you’re trying to find a good home for your grandmother’s machine.