This Electro Harmonix Little Big Muff Pedal was made in the early 1980's and sounds great. The potentiometer dates to 1984 which is a little late for one of these so it's possible it changed but doesn't look it. More...

Original 1981 Electro Harmonix Small Stone Phaser. Works great, nice and clean, sounds amazing. Super warm and lush phase tone. Comes with original box, too.