Sorry, not to sure but you can ask him on his website. Search Steve Howe, it's something Rondo. He seems good about answering questions and it is probably archived in there already. Saw him last week with Asia and Yes. What a phenominal player.
can't answer your question, but bump for an awsome guitarist!
It's a gibson switchmaster... If memory serves correctly the model no. would be ES-5 but I may be wrong about that. A google search of "gibson switchmaster" should clear it up.

For sale: Early 1985 Ibanez AH10 (Allan Holdsworth signature model) PM for details
It is. I dont know if they still make it or not.

Dean used to make a copy called the Palomino and theirs came in a surf green.