Lot of good comments on how to check out a use lathe here (I learned stuff)
Let me just say that I purchased the same SB 9 model vintage 10 years ago with a lot of kit to go with it for $1200. From your photos, mine looks like it was in better condition, but not by much.
I love my old iron, it's just the right size for what I do and I'd get one (in good condition) again in a heartbeat, $1200 on a brand new lathe wouldn't get me close.
Another plus for SB 9 is that they made a TON of them. Used parts and attachments are easy to find.
Give it a good look over, if there is nothing seriously wrong, $950 for lathe + extras is a pretty good price!