VINTAGE Eko Volume Pedal for Farfisa / Hammond Organs or maybe Guitars

Up for sale is a Vintage passive volume control pedal, most likely for controlling organ volume but likely usable with guitar as well. 

Definitely old skool, but very well made, and the cable and mechanisms are in very good condition. 

If you are a collector and have additional information, i'd appreciate you sharing it with me... I believe this is from the 1960s but cannot be sure.