I've read many times about the origin of the AC30 and that the very first model had a cabinet fitted with just one 12 inch speaker. The actual circuitry was quite different as well in as far as the output stage used two EL34 valves rather than the later arrangement of four EL84 valves.
I don't ever remember seeing a picture of that model and would not have thought that it was marketed. However, just a few days ago a friend of mine sent me a copy of some Vox leaflets in order to show me the early AC10 model and to my surprise the picture to the left of it showed the first AC30!
I've posted it here out of interest.