Rare Maestro MPF-1 Parametric Filter Overdrive pedal from the 70's. Has some scratches of course due to its age. See photos. Battery door missing like most and two rubber feet.
This model was supposedly used by Alex Lifeson of Rush and Joshua Home of QOTSA.
Selling in US only. Will not ship internationally.
Item is as is. Seems to work with a new battery. Not a guitar pedal expert so I don't know what to test for besides I move the knobs and the sound changes.