If you're looking at this you probably know what the Bluebeard Fuzz is. If not, this hard to get fuzz is a gnarly mod off of a 70's lamb's head Big Muff. For a muff it has a very clear sound with a good amount of string definition, but with very little loss on the low end. If you crank it up it gets super hairy. Great for heavy, downtuned stuff. Bass or guitar, it sound massive.
Standard, volume, tone and sustain knobs as most Muffs have them. It's a basic looking, no frills pedal, but it's a tone beast. I'm not even sure if he is making any more of these (as of writing this the site is done) but these guys are super rare and don't pop up for sale too often.
If need be I can upload a quick video of me playing this, but if you search YouTube there are a few out there already that give you the idea of what the pedal sounds like.