This Electro-Harmonix is in Very Good vintage condition with moderate wear and tear for a pedal of this age. 

The Big Muff Pi has been used by legendary guitarists such as David Gilmour (Pink Floyd), Carlos Santana, and later by Billy Corgan (Smashing Pumpkins), J Mascis (Dinosaur Jr.), and others, cementing its status as a classic fuzz/distortion pedal.  Vintage Big Muffs, especially from the 1970s, have seen a surge in demand as players and collectors seek the original sound and build quality that modern reissues attempt to replicate.