1920s motorcycle gearbox

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1920s motorcycle gearbox. 3 speed, 2 speed, 4 speed underslung motorbike transmissions. 1920s motorcycle gearbox with 2 stud, 4 bolt and frame rail attachments for Sunbeam, Triumph, Calthorpe, AJS, BSA, Matchless, using Sturmey Archer CS LS gearboxes