The reason why we like brands like Norton / Indian / Vintage Harleys / Ducati's is because , beside the fact that you can ride them daily , they have great mechanical details like for example the clutch !
Clutches in comparison .
The indian scout 741 clutch With modern Greer clutch plates - 1940
the Norton Dominator clutch 1960
And the Ergal ( modern compound alloy ) Basket for Ducati 916.-2000
i found this Clutch view interesting .