Fredric Effects clone of the green box Russian Muff. This circuit differs from the later black box Russian and is identical to the Red Army Overdrive. The Green Russian circuit is perhaps the most sought-after of the transistor muffs.
Mike Vennart's Green Russian on That Pedal Show
Bass demo by John Scott
The Green Russian demo'd as part of the Fredric Effects board for Soup Studio - from 2:25.