“Kakemawaru Shinobi no Mono” by Shinobi Kenkyujo is a clone of the original Ampeg Scrambler.
Wild fuzz with upper octave. It was originally designed for bass but you can use it for guitar as well. However, unfortunately the original circuit has a pretty low output; in fact 10 doesn’t even reach the unity gain. So if you’re using it with the guitar, i recommend putting a boost pedal after this.