An OEM Oscar FY-6 is featured in this August 8, 2017 Reddit post and mentioned in this November 19, 2017 Musician's Friend The Hub interview. Progress on an attempt to clone it is documented in this November 14, 2018 Reddit post.

Reddit, r/guitarpedals, August 8, 2017, "'All you need is fuzz' - 1960's Oscar Two-Knob Fuzz" (which includes the following comment)

This beautiful black box was the first pedal I ever used, and my dads first when he got it in the late 60's. He doesn't remember much about it other than that it used to have a plate that said "Oscar" on the front, and I can't find anything about it online.

What I've gleaned is that Shin-Ei licensed some circuits to the Oscar company in the late 60's for American sale & distribution. This only has two knobs (fuzz and volume), but no tone switch like the Shin-Ei Superfuzz.

Spitty, thick grains of fuzz that come and go really quickly, really nasty and organic feeling while you're playing. Very touch sensitive, like playing into an ancient, broken amp with tattered speakers. The EQD Terminal can get kind of close to matching this things sound, but has way more bass doesn't work as well with light playing.

Inside of the pedal has a 9v snap, but my dad always had an adapter to use 2x AA's instead of a 9v, which I think only gives 3 volts of combined power. I tried it on the Iso-Brick from 6v-9v, but switched back to the AA's pretty quickly.

I had more fun playing with just this for a few hours yesterday than I have with a full pedalboard in ages.

All you need is fuzz.

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https://soundcloud.com/a-b-33759113/oscar-fuzz-twinkle

https://soundcloud.com/a-b-33759113/oscar-fuzz-chords

Voice memo quality, but you can get a rough idea of the sound.

Reddit, August 8, 2017, reply on the aforementioned post to u/vox_repeater

Putting this into a board is definitely a chore due to the left-mounted jacks - combined with he fact that it absolutely has to be first in the chain or else the fuzz sound devolves into something resembling a bunch of forks in a blender.

Musician’s Friend, The Hub, "Vibing with Frankie and The Witch Fingers" (November 19, 2017)

Alex: I still have the very first fuzz pedal I ever owned, something my dad gave me. It was made by this company Oscar, who made pedals for Shin-Ei in America in the ‘60s. It’s not the Super Fuzz and it’s not the Companion Fuzz. It’s a kind of weird blended circuit. I opened it up recently, trying to clone it. All the capacitors are all the same values, but they’re wired in these crazy configurations. I’ve been using that one forever. It’s by far the best thing. I got an EarthQuaker Devices Terminal Fuzz for bass that’s almost identical to that fuzz, I think it’s a JAX clone. That’s when I realized that I really liked the Oscar.

The HUB: You probably feel better gigging with the Terminal, though?

Alex: Yeah, you don’t want to take something that old out.

Reddit, r/diypedals, November 14, 2018, "Where to find companion-style enclosures?"

Really want to get an angled / flip bottom enclosure for a companion style fuzz I’m working on, but am having the hardest time finding anything.

Greatly appreciate any leads - have almost resigned myself to getting a normal enclosure, cutting it at an angle, and making my own bottom for it.

Image for reference: https://goo.gl/images/nvc78j

Thanks in advance!