motomaniac and Doc, can share this one (great short story too btw Doc). It's Bickers on a 1938 499cc Rudge in 1961, where Dave won a special "vintage" (love the irony
) race.
Note the solid rear end and girder forks.
P.S. Dave would be a lot harder to pick if they had fullface helmets back then, his Superman chin gives it away every time.