The Mesa/Boogie Mark III is one of the most important amps in Mesa Boogie's history. It launched in 1985 and featured a third crunch channel, offering even more versatility to an already-winning formula . Slightly revised each year from 1985 - 1989, most of these amps will come with Reverb and Presence controls on the rear panel. The 5-band graphic equalizer and cosmetics are custom ! We got one !