For sale is a vintage and original 1980 Electro Harmonix Electric Mistress Filter Matrix and Flanger effects pedal. The tone of this thing is amazing, and it is in perfect working order. This is considered by many to be the best flanger out there for good reason. No modern issue can come close to the tone of this guy! It is in used condition showing cosmetic wear from use. There are two extra holes drilled into one side of the enclosure, and there is some surface rust on the nuts/jacks. Please see pics.  Pots date production to 1980, though one pot dates to 1976. The board has a midel number of 5100D which would make this a v5 issue. The circuitry is stock and the original tone is all there. The battery terminals are not original and screws for the enclosure are the only piece not original to the pedal. Only the pedal itself is included, a power source is not included.