This is a CEV Headlight Switch for the Ducati Bevel 900 SS 1975 - 1976 or other Italian motorcycles.  With mounting piece and with horn push button. The switch has 3 positions. Very nice state as this is a NOS part, see pictures.  

Ducati roundcase, Imola, Greenframe, SS, SD, GTS, MHR, SSD, Darmah, squarecase, S2, sport, supersport, Borrani, Ceriani, Scarab, Lockheed, Marzocchi, Brembo, monza , diana, mach, mach1, dm250, dm350, dm160, 160, 450, dm450, desmo, desmodromica, elite, elite 200, brembo, 900SD, Mark 3 , mark 2, CEV, 750, 750GT, 860GT, 900GT, MV Agusta 750 America GT SS