Deb,
That is a Singer 9W-7. They were made in the late 19 teens. The 9W-7 was Singers version of the Wheeler & Wilson 9D. Singer bought W & W out and continued with the one machine for several years.
If the cabinet and machine are as good as they look, and there are attachments and a manual I might be coerced to pay that price. But I think it's a bit steep otherwise.
They are excellent machines. Quiet, smooth and easy to treadle. The only big thing is they turn backwards from all the other Singers. In other words the hand wheel turns away from you rather than towards you.
Joe