Hello, I am at present researching and collecting information regarding the Guitars and Amplifiers that the "Sex Pistols" used between 1975 and 1978. Glen Matlock played a Fender Bassman in 1975/76. "Am I correct that it is a Bassman 100 (model from 19721977), Silverface piggyback head and cabinet of four 10" or 12" or 15" speakers?". Video: at 1min and 1.30min Any help in identifying (Year, Model, etc) this Bass Amp & "Cabinet" would be most appreciated. All the best.