This is a copy of the Ace Tone FM2 Octave Fuzz.
"The Ace Tone FM-2 professional fuzz guitar pedal circa 1969-1971. Made in Japan by Ace Electronic Industries Inc. which was the pre-Roland company started by Ikutaro Kakehashi before founding Roland/Boss. This effect has an amazing fuzz sound with an over-the-top octave making it sound just like the Univox Super Fuzz. If you happen to own the Roland BeeBaa (which is another highly regarded fuzz) this is the exact same sound -- I have both and believe me, this sounds way better." - EffectsFreak