The tube chart code 'ML' dates this amp to December 1963, in the middle of the approximately 8 month period when these unique Princeton amps appeared, offering brown face components and circuitry in a transitional black tolex, blackface control panel, and white knobs. Rare and toneful, this amp has had a 12" Vox speaker fitted, but is otherwise original and sounds great, with a deep tremolo. 240V. Footwswitch included. Please enquire for price.