I would be careful. A 70´s device, "Organ" and "electronic" in its name sounds slightly something like a Organ with pure sine waveforms (switches labeled with "flute" and such things) . I guess some of these buttons are the controls from a beatbox, but don´t expect anything from it. I had a early 70´s transportable Organ, double manual, tons of switches, but it was exactly what i´ve described: Nothing. Trash.
You can take the risk, but i would not do that.
Stef