In April 1961, high-performance 'SS' variants of the Dominator 88 and 99 were introduced boasting twin carburettors, enlarged inlet ports, a siamezed exhaust and the camshaft of the 650cc Manxman. Dropped together with the other 600cc twins when the 1963 range was announced, the Dominator 99 SS is one of the rarest of post-war Norton roadsters. This matching-numbers example was purchased by the current vendor in 1987. Although non-standard in some respects: exhaust system, rear mudguard and single carburettor, it has the twin-pull throttle cable in place (connected to the single Amal) and comes with its original twin-carburettor inlet manifold. Used regularly but sparingly since acquisition, and last MoT'd to August 2015, this rare machine comes with an old-style continuation logbook (1971), two expired MoT certificates and two old-style V5 documents.