There were hundreds of machine makers in the early days of sewing and this is not even close to being a Singer.
The machine in question is from around the 1850's to 1870's. What are they asking for it may I ask?
I would do nothing but clean it up and see if I could get it working. But trying to find a needle for it will be near to impossible so you might have to make them for it.
But a paw foot is always a nice machine to own!!
Billy