Matchless G80 Silencer, Iron Head, Hairspring Valve 500cc 1949 1951-55 500cc G80 Jampot Low Level Swept up System 1956- 500cc G80 with Girling Shock Absorbers for a Low Level Swept up System i.e. G80CS 1964 1 3/4" chromed Made in England MufflerPlease look at ALL pictures