VSMS= Vintage Sewing Machine Shop, on this board. This looks like a model 27, with that ginormous harp space! It's a vibrating shuttle machine that winds the long bobbins, rather than the round ones modern machines use. I don't think these were produced that late into that century. Maybe the 20's, at the latest? What you need to do is get the seller to send you the exact serial number and then you can look up the model and year of manufacture on the Singer site.
I would think it was worth no more than, $150, if in really great shape cosmetically. It does have lots of attachments and the book. That's a plus and worth part of the price.