This is a CEV Head Light for a Ducati Bevel Single 250 350 and 450 and other Italian motorcycles of the period like Moto Guzzi Benelli Aermacchi etc.  Shell # 04610, glass # 8691.  The window is 130 mm. With internal parts, switch and separate CEV key. The chrome is not concours.  Very nice state, 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