Here's a Maestro Stage Phaser from the 70's made in the U.S. and in very good condition. The controls include speed and balls (Feedback) knobs plus a center rotary knob which gives you fixed slow/fast speed and a "Var" option which let's you change the speed with the Speed knob. The pedal can accept either 9V battery or 12V power from a power supply (Please note you'll need a 3.5mm adapter) The pedal is in great shape, the side lights work, but the battery cover door is missing.
 
Ships from Athens, GA. Does not include power supply.