I was offered one in italy about 6 years ago for around £12000, so maybe you have a good deal. I reckon that barring a certificated race bike (or an Appollo ) this must be one of the rarest Dukes around. I have only ever seen that one genuine one so I guess most people would mistake it for an ordinary () SP. Can't imagine you would ever lose money on it though ypu lucky so-and-so