MJM Britbender Fuzz. 3-Knob version with 3x germanium transistors. Killer versatile tone shaping available from the tone knob.
*Note that this pedal requires a positive ground power supply. It cannot be daisy chained with a non-isolated power supply. It will work fine on battry, its own wallwart, or isolated units such as the Pedal Power or 1Spot Pro.