“The Monsterpiece MKII is a two transistor Tone Bender MK 1.5 circuit. Similar sounding to a fuzz face, but has more gain and volume output. It is very responsive and dynamic. All germanium transistor circuit. Controls for volume, input bias, and fuzz. Effect requires either 9V battery or boss style 9v adapter.”
More information on a newer version of this effect can be found here.