Not a perpetual motion machine, but proof of principle for what might become one.
Over-unity means generating energy from nothing. Whereas a perpetual motion machine must cause itself to continue moving not only once, but repeatedly.
In other words, this is a successful time-frame of a principle that would work, with the right additional design.
My argument for how it is over-unity is as follows:
1. It begins from a position of rest, with no battery power (correct).
2. If the mobile marble is prevented from moving the additional fall-length to the bottom, then all motions are recoverable, since the mobile marble begins at a lower height, allowing for a short length of drop at the end of the upwards-sloped track.
3. The counterweighted lever which permits the motion returns to its initial altitude automatically (it does).
4. The marble has the strength to cause the initial leverage position to sink to the bottom (it does).
It goes up, it goes down, with no loss of energy, from a position of rest!
In other words, this is an example of over-unity!
See a more technical description at Academic Room. Notation: some of the technicalities have been deleted, due to a single complaint. E-mail me at contact@nathancoppedge.com if you want the details on the over-unity experiment.