European Watch Clock and Jewellery Fair 1991 BF 611
“The Rolling Stone” is how Delma calls its newest table clock. It is made of Conan, a new substance made from stone and epoxy resin that is particularly resistant to shocks and corrosion. Two similarly shaped elements are “plugged” into each other at a 90-degree angle, resulting in a perfectly harmonious construction : the clock itself may roll back and forth but always returns to its place. (DELMA “The Rolling Stone”)