My Mark IIB Boogie back that is. A NAD, I first bought this amp in 2011, traded it in 2016 for a nice Silverface Fender Deluxe Reverb. I recently saw it for sale locally and I had to have it back. I’ve owed a Mark III, another Mark IIB, and a Mark 1 RI since selling this Boogie. It is a 1983 Mark IIB, with Simul-Class, Reverb, and an EVM-12L. This amp sounded the best of the bunch, and I’ve never seen another Mark IIB with this blue tolex, silver grill cloth, and Mark IIC knobs. I believe that it was a factory special order. Sold most of my amps, down to a Marshall, a vintage BF Fender, and now this Boogie. This three amps should cover my tone needs for quite a while.