So the Univox Super-Fuzz from 1972.
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Most of all in my life I love strumming powerchords Just hit any fuzz box and goin insane you know. I`ve tried several octavio type fuzz boxes until I realized that I need something more. To my ears they sounded a bit thin. Then accidentally I got this box for illegaly cheap. Oh god, it got so deep , dark and even evil sound with octave-up growling. The internal trim-pot changes the octave-up mix or smth like that. So the octave can be the switched off completely.
So if you like bluesy fretboard-wanking - you can check any other demo on youtube. I love blues, but this box says : play doom or I`ll doom you