While I have never thought seriously about buying one, mainly because I just could not ride it more than around the block, I would be probably be willing to pay big for the right one, even if I just used it for decor in a rec room or something.
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1971 Paramount P-13 Chrome
1973 Paramount P-15 Opaque Blue
1974 Raleigh Professional Blue Mink
1991 Waterford Paramount
Holland Titanium Dura Ace Group
Holland Titanium Ultegra Triple Group