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Lot 679: c.1960 Matchless 646cc ‘G12CSR’

Collectors' Motorcycles, Bonhams (22 October 2006)

Announced in 1948, the Matchless G9 and equivalent AJS Model 20, while following the established pattern of British parallel twins, were unusual in having a third, central, crankshaft main bearing. The new 498cc engine was housed in the sprung frame recently introduced on the heavyweight singles. Progressively developed, AMC’s twin-cylinder engine 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 The new range-topping super sports models were typed ‘CSR’, a designation AMC had first used on the superseded 600cc versions. 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. This Matchless twin would appear to have been fitted with an engine from an AJS 31CSR as indicated by the ‘31CSR’ engine number prefix. The vendor discovered the machine in Twyford, Gloucestershire and shipped it back to his home in Austria where it was fully restored both mechanically and cosmetically. The machine is offered with restoration invoices and Swansea V5 registration document.

Lot Details
Auction Collectors' Motorcycles
Bonhams, Staffordshire
Lot Number679
Outcome NOT SOLD
Hammer Price-
Hammer Price (inc premium)-
Condition rating0
Registration number
Chassis number76002
Engine number31CSR X2533
Engine capacity (cc)
Engine - cylinders
Number of doors