Hard to say...the prices are all over the map. If all her accessories are there, and if the machine head is in good condition and the cabinet is good and the irons are good....see what I mean...there are so many variables. You can kind of judge how much it would cost you to replace anything missing or that needs repair. Start with a base of about $100-125 and subtract for missing/damaged items from there. I got a model 15 in a straight leg treadle that is dated 1956 for $75. I'm in CA. I really wouldn't go over $125 unless you really really want it and it's in really really good shape.