The JCM 800 Marshall is widely regarded as the stepping stone on which most modern high-gain amps are based. The design continued to evolve through the 1980s, leading to models like the 2210, which added a second channel and built-in reverb.
This amp is all original and comes with a 1997 2x12 cabinet (model 1936) loaded with G12T-75 speakers, making for an excellent pairing.