Hugh, you need to do the necessary due diligence to document the history. Spend some time to create a good story about the bike. Do research on comp sales. Dig around Bring A Trailer, Ebay and
Classic Sport Bikes For Sale | Rare SportBikes For Sale. Try to find some completed auctions.
Put it on Ebay with a super high price and a "Make an Offer" option. Have a price in mind and see what happens.