It's a Big Muff, but with... a handy couple of extra switches. First, there's a switch to bypass the tone knob. You want it bypassed, it sounds better. The wicker switch adds some extra definition, zing and crispness to the attack, so you want that on I'd say. See, I am a helpful guy after all.

Model: Electro-Harmonix Nano Big Muff Pi with Tone Wicker
Made: USA
Type: fuzz
Power Input: standard 9v DC centre-negative (supply not included)
Accessories: none

Condition notes: used, no major marks. Tested and fully functional.
Overall: very good condition (8/10)