Also, if you've got a nice seat, you could probably find a crappy seat, remove and thin out the foam, cover your nice seat in 1/8" or less of the foam padding, put some rips into the pleather seat cover from the crappy seat, and use it to cover your seat so that you have a really comfy seat that looks like a piece of crap.
Seat is nothing special but could be a give away. The plan there is to get one of those aftermarket Schwinn padded seat covers from the local bike co-op, they have several of them in the seats bin that look like crap. They just drawstring over the seat and look as dorky as they are disfunctional.
It's got enough scratches, nicks and minor surface rust to look its age while being a long way from having structural issues.