This is a brand new gearbox transmission sprocket.

Part # 57-1919, T-1919

Sprocket teeth: 20      
Chain size: 530             
Chain Pitch: 5/8" X 3/8"                     

Fits: Triumph unit 650cc with 4 speed from 1964-72
        Triumph T150, BSA A75 with 4 speed from 1968-72


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