You know, it's funny how some bikes were as popular as but you don't see them anymore.
For example, I see any number of SP370s around, even saw one riding around town the other day, yet back in 1978 there just weren't that many on the road. But PE175Ns, there were truckloads. And DT400Ds everywhere. Never see em nowadays. Where'd they all go?
Nice bike for a big heavy old traillie, but not all that special really, so I doubt one would be worth much. I'd pay maybe $1000-$1500 for one in good nick...