Sprocket, gearbox spacer, Norton upright, with AMC sprkt

Gearbox axle sprocket spacer to AMC gearbox sprocket for Norton upright and dolls heads gearbox. Allows later sprockets to be used on Norton upright gearbox.
Original part number:
040131UPR - spacer for axle sprocket (main to suit dolls head and upright gearboxes pre 1949)