Well, if it is freshly serviced and comes with a few feets, then I think it`s a good deal. Getting a vintage sewing machine in shape is a very time consuming job, and even if I like it, I would sometimes have paid twice the time I paid for some machine just to have them ready to sew!
You also have to consider the area... I'm sometimes looking for sewing machine in Ontario because hubby works one day a week in Ottawa, so I can tell vintage sewing machine are more expensive in Ontario than in Quebec. Don't know why...I would for sure try it and buy it if I like it.