The Norton is a 1929 ES2 model. The ES2 shared the cycle parts with the cammy CS1 but this one clearly has a pushrod motor. The pushrod springs appear to be enclosed, identifying the bike as an ES2. The oilpump on the timing chest, though barely visible, looks to be a Best & Lloyd "Mark IV" fitted to the 1929 models. The early ES2 models were quite special and very fast, with engines that clearly differed from the M18s.
Great bike! Nice swimwear and what's the guy with the cigarette in the lower pic doing with his right hand?
