Fairfield Circuitry Modele B OD

From the manufacturer:

For everyone out there who nevers turns off their Barbershop, this is for you. The same circuit in a tiny box, no bypass switch, no light. You can select between two tone options via a jumper inside the pedal:

flat and wide, like the original Barbershop, like the middle tone position of the Millenium Edition
light, high frequency cut, like the right tone position of the Millenium Edition
Always on, never off, this is serious.