So my girlfriends dad has a Zunow sitting in his garage and after 3 separate lower back surgeries (fell off a cliff while stationed in Afghanistan) he isn't going to be riding a bike any time soon. I asked him to sell it to me. I don't know much about the bike maker. How much should I expect to pay for it? All I know is it has Shimano 600 groupo and looks exactly like http://classicrendezvous.com/Japan/Zunow/Zunow%201.htm