Shin-Ei Companion FY-6 Super Fuzz
Serviced, in excellent working order and sounding stunning. This is the circuit that launched a thousand fuzzes - possibly most famously from Univox, but it was re-badged or licensed many times, not to mention supplying plenty of inspiration for the Roland BeeBaa and Fender Blender, and not to mention the near identical Ibanez Standard Fuzz.
This one has lost it's badge - it may well have been a "Companion" or one of the other numerous re-badged versions that Shin-ei made, at least some of which had this identical case (e.g. the Jax FY-6 Fuzz Master, Mayfair Model No. 9540 Super Fuzz and Teisco TF-1 Fuzz to name three - if you want a full run down then the effectsdatabase Shin-ei FY-6 page is the place).
This is the circuit that launched a thousand fuzzes - possibly most famously from Univox, but it was re-badged or licensed many times, not to mention supplying plenty of inspiration for the Roland BeeBaa and Fender Blender, and not to mention the near identical Ibanez Standard Fuzz.
The name is really irrelevant - Master Control, Duo Fuzz or Super Fuzz - the sound is what counts: it's basically two very different shades of monstrous filth - ripping chainsaw fuzz or brutal octave-ish wildness.
Integral to the tone of a list as long as your arm of guitar icons (check the Wikipedia Univox Super Fuzz page) - if you don't yet have one of these in your fuzz arsenal then this is a great example.
Aside from the missing badge it is in good, clean condition with just a few dings and some wear to the edges of the case.