Looking at the styling, it's in the 400 series. Sorry, I can't get closer than that. It looks like it's straight stitch only. People like them but as far as money value goes that's always a hard thing to do. I tend to be on the cheap side. If I really loved the machine and it was in good shape maybe up to $100. To me, around $50 would be more realistic. As much as we love them here there isn't a huge market for used sewing machines. Also keep in mind prices vary a lot by region. Your market may be far different than mine. You can try to find completed listings for similar machines on Ebay to see what they're really selling for. Local sales usually bring a bit less.
I hope this helps,
Rodney
EDIT: There were a few replies while I was typing.