The Hammond Novachord. You've heard them, you just never knew what they were. It's a genuine polyphonic synth, with a bank of oscillators feeding serried ranks of dividers and clever wave-shaping/note-shaping circuitry and every active component is a great big ol' vacuum tube. "Ahead of its time" doesn't even come close.
...Amazing as it is, now consider the kind of dedication and talent it takes to restore one from "found in a garage" to "like new" and then play it!