I own an ‘85 PSN10 and ride it regularly. Super Vitus tubing is very light and a good ride. I would expect to see Campagnolo Triomphe shifting and Modolo Speedy brakes. The Mavic wheels are likely Module E laced to Helicomatic hubs. The PSN10 uses a quill seatpost so you’ll want to make sure it’s intact and functional. They’re a pain to source and replace.
Condition determines the value. If it is in very good condition, I think $325 is a good price.