Needed the rest of it to date it properly they made the 750ss's for a while, remember in the early 70's 750's were the largest size race class.
from the pic I can tell it is
an early roundcase 750ss a 1974 model give or take a year (based an the scarab front brake and not the bembo).
http://bikerscafeblog.com/2011/03/16/chanel-keira-knightley-ducati-750ss/
some history...
....In 1973 the production Ducati 750 SuperSport model was unveiled, with an Imola kit for the intending racers. The bike was distinguished by its slim green frame, gaping bell mouths on 40 mm Dell'Ortos, half fairing, fibreglass sports fuel tank with clear fuel-level strip down the side, and single seat.[5]
By now the GT and Sport had steel fuel tanks. The GT had shorter rear shocks to lower seat height for the American market, but it meant the bike would ground out more easily when cornering. The Amals on the GT were replaced by 30 mm Dell'Ortos with accelerator pumps. This reduced fuel economy a little.
In 1973 the Barcelona 24 hour race was won by Canellas and Grau on a round case Ducati 750 SS converted into an 860 by the use of the Ducati 450 single-cylinder engine’s sleeves and pistons. In 1974, the 860 GT went into production. The crankcases had been redesigned by Giugiaro, along with the rest of the bike, with a squared off look, quite unlike the flowing lines of the 750.[6] The new boss De Eccher saw Ducati’s future in US exports, and had engaged Giorgietto Giugiaro to do the external design work on the new 860 instead of Tartarini. Taglioni was made to redesign the outer engine cases to match Giugiaro’s design. (The new 350 and 500 GTL sport vertical twins were also released, also externally designed by Giugiaro. The motors were not built by Taglioni. He had refused to be involved with them.)
Ducati sales fell. The 860 GTS did not sell well, and the vertical twins were hardly selling at all. De Eccher was out, and Taglioni was back in favour, and so, by association, was Tartarini. A hasty re-design of the fuel tank and seat was undertaken to create the 900GTS - a model destined to help the company regain some ground. At the same time plans were put in place to create two new models the Darmah and the Pantah.
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I have a 1978 900 GTS, the last of the line with that engine.
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