I have the opportunity of buying this awesome 51' Columbia that is all original with only one owner. I'm not sure what the value of this bike is in great condition. From the condition found in the pictures, would you say this bike is worth paying $520 for? I'm honestly worried about the rust on the bike and how expensive it would be to clean this bike up? Is it worth cleaning this bike up or would you leave it in the condition that is pictured. Any immediate help would be great appreciated! Ultimately should I pass on this bike or should I buy it and put money into cleaning it up? Thanks for all of the help!