For a long time, the Timmy, and its big brother, the Tim were build by Paul Cochrane, who amassed a waiting list that often exceeded a couple years. In fact, a used Timmy was worth more than a new one because you didn't have to wait. 

It was famous for both its grit and transparency, the holy grail of overdrives. 

This version of the pedal is produced by MXR in collaboration with Paul Cochrane

MXR Timmy Overdrive. This pedal provides a huge, responsive range of gritty and textured tones that enhance the sound of your rig while preserving its fundamental character—and in an MXR mini housing, this pedal will free up some serious pedalboard space.