The Colorsound Tone Bender Distortion, one of the lesser known Tone Benders - which also happens to be a recent D*A*M collaboration with Colorsound (Macari's Music), who released a faithful reproduction using original circuit boards after some were found in a basement.  

More information can be found on the D*A*M forum which is a very handy source of information for all things Tone Bender.   Just don't go asking for advice, it's not really a builders forum from what I can tell.

The Colorsound Tone Bender Distortion is more overdrive bordering on distortion than bender - there are zero similarities between a MKI, MKII or MKIII bender and this beast. 

COLORSOUND TONE BENDER DISTORTION - POINT TO POINT LAYOUT

SCHEMATIC

This is probably more like an overdrive than a distortion, as the diodes are soft clippers

Gain @ 100% - Tone pot sweep

Tone control is a variation on the classic big muff