Thank you for viewing. This is the ELK Instruments "BIG MUFF SUSTAINAR". Several versions of the ELK Instruments "BIG MUFF SUSTAINAR" manufactured in the 1970s exist, and this unit is an early model. The logo wear is minimal, and I believe it's in good condition for its age. EarthQuaker Devices' Hizumitas, co-developed with Boris guitarist Wata, was modeled after this unit. It is a very rare Japanese-made fuzz pedal gaining cult-like attention worldwide. This listing is for the pedal unit only. There are some scratches, scuffs, and stains in noticeable areas, and the condition of the material itself shows signs of deterioration, but it is still usable. *Returns are not accepted due to the customer's circumstances. *We try to describe noticeable scratches and stains with photos, etc., but due to the nature of used items, we cannot list all minor scratches and stains. Please understand the listed condition before purchasing. ELK Big Muff ELK BIG MUFF SUSTAINAR SUSTAINER