Electro-Harmonix Op Amp Big Muff Distortion/Sustainer (used)

Excellent condition and in perfect working order with original box. The pedal shows light signs of use but is overall very clean and functions without issue. 

From the manufacturer: With original late-70s Op-Amp Big Muffs selling for exorbitant prices, Mike Matthews decided to take the power to the people and reissue the classic pedal at a price that players could afford! The circuitry of the new Op-Amp Big Muff —sometimes also referred to as the IC or V4 Big Muff— has been faithfully re-created while several practical enhancements have been added including a compact, die-cast chassis and true bypass switching.