Я не знаток, но возможно это Dan Armstrong plexi.
http://www.ampeg.com/products/daplexi/ada6/index.html... и добавил:Из интервью с Монкманом:
VM: Apart from playing all sorts of keyboards you also play various guitars, one of which is a plexiglass guitar. Sounds unusual. Can you please explain to me what is a twist of this instrument? Does it demand any special technique from a player?
FM: No, it was simply an attempt by designer Dan Armstrong to produce a solid-body electric with greater rigidity and mass than an equivalent wooden one (it is extraordinarily heavy), in order to prolong string vibration. I believe Spirit were the first band to use one, and Darryl and Nick (see next answer) were both great fans of Spirit, as we all became - or at least to some extent.