For sale is a Mesa Boogie Mark IVb Long Head in excellent condition. I honestly can't find anything worth noting as far as cosmetic flaws. The amp looks really clean. Had it serviced by my amp tech in the last year. Equipped with Ruby 6L6s and footswitch will be included.
This used to be mine. Seriously, the cleanest Mark IV I've seen outside of a brand new one, straight off the factory floor. This amp, in particular, is absolutely killer. Wish I had the cash to pick it back up. Good luck!
I shot out a loop-modded IIB, Mark III++, Mark IVb, and Mark VII this year. Mark IV was king IMO (though I kept the IIB and did some mods on it). Don't sleep.