Vintage 1970s MXR Blue Box Script! It has a small scratch, and is missing a screw, shown in the pictures. It works and sounds great!

The 1970s MXR Blue Box is a classic analog octave fuzz pedal known for its thick, aggressive fuzz and unique two-octave-down effect, famously used by Jimmy Page on the "Fool in the Rain" solo. These vintage units, particularly those with the "script" logo, are highly sought after by collectors. Key Features & SoundThe MXR Blue Box produces a distinctive, unpredictable sound that blends a square-wave fuzz signal with a sub-octave signal two octaves below the original note. The resulting tone is often described as glitchy, synthy, or like a "broken early 80s arcade machine". 

• Controls: The pedal is simple, with just two knobs:
• • Output: Controls the overall volume of the effect.
  • Blend: Adjusts the mix between the direct fuzz signal and the two-octave-down signal.
• Sound Characteristics:
• • Fuzz: The fuzz itself is thick and gated, with a short decay.
  • Octave Effect: The sub-octave is monophonic and tracks poorly when multiple notes or chords are played, leading to its characteristic glitchy and chaotic nature.
  • Versatility: With conservative settings, the sound can be a subtle fuzz/octave, but cranking the blend knob results in a wild, untamed tone.