I am lucky enough to own one as well as a couple of Commandos, The N15, or the Matchless version the G15 were known as 'hybrids' as they incorporated parts from both Norton and Matchless after Associated Motor Cycles acquired the Norton name to add to AJS and Matchless. The only difference between a Norton and a Matchless example of these is the tank badges and the engine prefix. They were one of the first dual purpose machines and were campaigned in desert racing, although you have to take your hat off to anyone who was able to hustle one of these in the dirt at speed 'when men were men and sheep were afraid'!