In 1963 there were four models offered of the G12. There was the Standard, De Lux, the CS (Competition Sport) and the CSR (Competition Sport, Road). They all were 646cc vertical twins with the 4-speed ...

Matchless built their first vertical twin in 1949, the 500cc G9. In 1956, they punched it out to 600cc and named it the G12 (seen here). In 1959 they punched it out again to 650cc and called it the ...