I found this Dahon Classic on craigslist, the guy wants $75 for it.

What I can't tell is if it has an internal hub, derailer, or if it's a single speed.
The guy told me it doesn't have a "gear changer" and the only time he rode it as he pedaled faster it changed gears, but I didn't think Dahon used any of that gimmicky auto shifting stuff. He said there are 3-4 cogs on the back. It is so hard to get good info from people that know nothing about bikes...

Thoughts? Worth the price?

Here's the one pic i can get