You know what it is ;) The original and best. This one was purchased in the summer of 1981. I'm having to scale down my touring rig as we're going in the box for live shows, automation, and all that jazz funk! Proco RAT (ex - DNA A Flock Of Seagulls) Post or collect in person. One knob replaced.

ProCo Rat Big Box Version 2 1981 - 1983 The main difference between this model and the earlier version is the switch from a tone to the filter control. The filter cuts high frequencies as it is turned clockwise. The RAT logo was also switched from an all caps logo to one that was more stylized, while the “a” and “t” were now lower case. Features: Tone Control - Highs are decreased as knob is turned clockwise using a Logarithmic taper pot Pro Co Sound Logo with "Sound Inc" vertically on side Now using only Electrolytic caps for larger values. Rat logo now using lower case "a & t" Knobs are now what will be the standard up until mid 2000's Distortion, Tone, & Volume labels closer to top edge of pedal than Ver. 1. There is no battery door on the bottom.