I have two options here, I can either buy an early SLM 810e (single 1/4” input) also before the serial # change so I guess that means it is made 86-88? that is $450. Second option is another SLM 810e. doesn’t have the giant handle on the back though. serial # dates it to 1997. But, this one has the 3 1/4” and 2 speakon jacks in the back. I know this one is 800w but what about the older one ??