I think most equate JCM800 with JCM800 2203 100w Master Volume. But, there were other models, like the 2210 Channel Switcher 100w, and there was a JCM800 1959 4-Hole Super Lead. The 2210 is unique to the JCM800 line. There were JMP 2203s and 1959. For 50w versions, 1959>1987, 2203>2204, and 2210>2205. There were bass models, too.