Agreed that this looks to be an '85 Trek 620. I dunno if it's worth $500 but this is an awfully nice bike and you certainly aren't overpaying at $500 (or $450). These bikes are rare and good quality. I had an '84 Trek 610 also made of Reynolds 531 CS (Reynolds 531 main frame and chrome moly fork and stays). It's nice tubing and the bike will ride nicely. The original rack is a nice touch as well.