1962 AJS Model 31 CSR, 646cc. Registration number 675 XVM (non transferrabel). Frame number A83232. Engine number X8361. Associated Motor Cycles was late in producing a twin-cylinder model to rival those of Triumph, BSA and Norton. When announced in 1948, the AJS Model 20 and equivalent Matchless G9, while following the established pattern of British parallel twins, were unusual in having an engine with a third, central, crankshaft main bearing. The new 498cc power unit was housed in the sprung frame recently introduced to the heavyweight singles line-up. Progressively developed, the motor underwent a number of capacity increases, finally arriving at 646cc in the autumn of 1958 with the launch of the AJS Model 31 and Matchless G12. The new range-topping super sports models were typed 'CSR', a designation AMC had first used on the superseded 600s. Well-finished, stylish, and deservedly popular despite lacking the performance image of certain rivals, the AMC twins were much missed after their demise in 1966. XVM has been subject of a comprehensive restoration with a rebuilt rebored engine, reground crank, new valves, new tyres, front mudguard, seat. Resprayed with new tank panels and badges, relined tank. It starts and runs well and all the electrics function as they should. Sold with the V5C.