"The Matchless G12 was produced by Associated Motorcycles at the former Matchless works in Plumstead, London. Developed in 1958 specifically to capture the potentially lucrative US market, it was one of the last motorcycles made under the Matchless name. It was also produced as the AJS Model 31 by the same company. Designer Phil Walker knew that it had to be a 650cc but wanted to use as many parts from the Model 11 as possible. The cylinders could not be bored out further so the stroke was lengthened from 72.8 to 79.3mm resulting in a capacity of 646cc. This meant developing a new crankshaft and primary chaincase which also provided the opportunity to add a Lucas alternator. 
This Matchless was restored a few years ago and still presents in nice order today. We are advised by the vendor that she runs well and is a good starter. These handsome bikes with their semi-chromed fuel tanks are a testament to a once thriving British motorcycle industry. Supplied with a V5C registration document."