cereal,
IIRC, it's a period piece from top-line, late 60s/early 70s Brit road racers,
used by Rickman and other Lockheed/AP-phobes - an OEM fitment on some Rickmans
cool! - OZ-based Guzzi/Ducati expert Ian Falloon backs me up here -
http://books.google.com/books?id=Ve...result&resnum=3#v=onepage&q=Guzzi ZDS&f=false
further, from "Vintage Motorcycles Online" -
"....Kerker ditched the Ambassador’s shrouded forks for a set of Rickman trees and tubes,
complete with its large diameter cast alloy carrier for the Lockheed disc brake....Ready to race, the bike tipped the scales at 331-lb...."
shown below is a German Horex 500cc Rickman prototype with this hub,
& a 2nd of the Guzzi, from the backsde, clearly showing its details