Single overhead cam Marianna Grand Sport, ex Jack Silverman collection restored by his team at his Colorado museum. The tank is aluminium seems to have been signed by Giuliano Maoggi, winner of the 1956 MotoGiro Di Italia, The frame has the correct GS numbers, also other numbers from the road bike series, I have no information whether these were added for registration reasons or frame was converted following a crash, the Ducati archives are not available any more. The frame is however identical to a Grand Sport model and does have the correct swingarm, 2 position top shock mounts, characteristic and original "S" bend in rear engine mount tube and the wide rear engine mounts, unlike the narrow road bikes as crankcases are much wider. These are the first race bikes built by Ducati, first series were 100cc, this is second series with 125 cc. Original Amadoro magnesium brakes/hubs with original 17" WM1 alloy rims and special Baroni 34.9mm forks. Special 22.5 Dellorto SS1 carb, All electrics with original lighting kit including generator. I have the NOVA certificate, could be registered and run on the road.