Rob, an odd co-incidence, but I've just received my NOC magazine today. It has an old article by the late Peter Roydhouse about pre-war Trials Nortons.
Peter refers to the 'extras' available betond the standard £5-extra Trials Spec and these included "Folding kick-starters,two types of sump shield, short footrest hangers, alloy barrels, fork bump-stops, long handlebar levers...."
Quite a few of these extras formed the basis of either the WD or India Office models, but I'm not aware that the long levers did...it might well be what you have there though...Certainly worth advertising it as such. With the 1 1/8" centres, it is highly likely to be Norton.
