This is a CEV Head Light Rim for Italian Motorbikes with 170 mm window. the Moto Guzzi V7 850 T Lemans, Fits for instance CEV type 168 and 177 optic units. For Moto Guzzi models V7 850 T Lemans, Ducati Bevel 750 900 SS and  Laverda 750 GT S SF models of the early seventies. 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