Original Roadbox from Speakeasy, built from a converted 25 or 125 Leslie. They added handles, an upper shelf, and horn. They also replaced the amplifier and crossover to create either a 122 type or 147 type cabinet.
I have it listed as a 6 pin unbalanced (IE 147) as this was far more common but there were some balanced (IE 122) types built – check the amplifier to be sure.