Maestro RM-1B Ring Modulator Footswitch It doesn't have any of

It doesn't have any of our sounds in it anymore as its been totally sorted by a tech and none of the original patches were saved

Working well and sounding like a good Space Echo should

Condition is very good with some minor dings to the face

From Guitar Geek:

Maestro RM-1B Ring Modulator Footswitch It doesn't have any ofSuper rare early 70s effect unit. For sale serviced, calibrated and sounding wild. Note you will need two balanced (stereo) 1 4" jack cables to connect a control pedal (not included) to the unit. You can use the unit without the pedal and slide the controls by hand. Condition is clean with some scuffs and dings as you would expect, and oxidation scattered across the metal sections of the unit. There is one slider cap missing. See photos for more