VINTAGE!!
Narrow Box V1 First Series 1975 Japan, four C828 Silicon Transistors
The great grandfather of the TS-808, although a totally different beast. They called this ovedrive but in reality it's a really thick fuzz.
Great sound, sustain for days!

It has four C828 Transistors.
The circuit is based off the famed Ram's Head Big Muff and can shift from overdrive into full on Big Muff fuzz territory, and it does it very well.

Ibanez OD-850 Overdrive Narrow Box's were produced in 5 different versions :
V1: First Series with Script Logo, No Flying Fingers, No Power jack,
Knobs for Distortion, Tone, Balance (1975 - 1978)

V2: Block logo, with Flying Fingers, No Power jack;
Knobs for Distortion, Tone, Balance (1978/79)
V3: Block logo, with Flying Fingers and Power jack;
Knobs for Distortion, Tone, Balance (1979)

V4: Block logo, with Flying Fingers and Power jack;
Knobs for Distortion, Balance, Tone (1979/80)

V5: Block logo, without Flying Fingers, with Power jack;
Knobs for Distortion, Balance, Tone (1979/80)