This is the ‘one before the current’ BH500.  Made just before the lunch-box size heads became popular during the ‘size isn’t everything’ wars. It’s a very versatile rig.  The amp has three memory pre-sets so great if you are using multiple basses (I have fretted on mem 1, fretless on mem 2 and then use mem 3 at the open mic so no one shags up my settings!). It incorporates a 5 string tuner and mute function and a few ‘toys’ like TweeterTone, Spectracomp and TubeTone to play with.