I recently purchased a vintage hard wired Bass Micro Synth. I was hoping someone could help me date it.

Also, I’m not sure if the octave slider is working properly. It definitely does something, but it’s not a pure octave, like you would find on a POG. It has the original pitch and adds a faint octave, or brightness, to the signal even when the guitar slider is all the way down. Is this right? This is my first hands on experience with one, so I’m just wondering. I’m loving the sounds I’m getting, but I don’t want to be missing out.