Great thread Sixty Fiver! I'm not really into sewing machines, but like you I appreciate old, well designed, durable machinery. Got a Singer treadle table some years ago and thought about using it as a table, and then found a Series 15 left on the curb. It was rusted and jammed, but intact. Put it on the treadle, cleaned it with WD-40 and oiled it, it runs OK now. Serial number says it's from 1923.