"Kool" Vintage Sardonyx Guitar

This unusual-looking Sardonyx guitar is not only an ultra-rare beastie, each guitar being custom-made, but also comes from the estate of Amir Bayyan, formerly known as Robert Bell or "Kool" of Kool and the Gang.

The only time I remember seeing one of these guitars before it was in the hands of someone quite different - the guitarist of The Plasmatics.