2 1/2″ Standard domed chrome cap.
Made in England.
As fitted to :-
Triumph 500,650,750cc models (1951-81)
BSA 750 A75 Triples and many other models such as Velocette,AJS/Matchless and Royal Enfield.
Chrome Plated: Yes
Vented: Yes
OEM: 83-3875,29-7898,15941,01-3325