This is Tommaselli Daytona 2C Throttle for a Ducati Bevel 750 GT and Sport models.  Also for other Italian Motorbikes of the period like the Laverda 750 GT S SF or Moto Guzzi V7 850 T Lemans or ,,,,, . This is the early model with the high placed stop screw. With nice boot and mounting clip and cables. In 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