Tapio Wirkkala for Rosenthal, Duo bowl, Form 12517, decor smokegray 1 19807. Design in 1961. Diam abou 195mm, height 73mm. Signed Rosenthal, Tapio Wirkkala, At the bottom clear marks of usage.

Rosenthal Glasswork rented the Kristal-Glasswerk Amberg in the early 1960s and produced a collection there.
A speciality of this collection were the mouth-blown, coloured glasses, in multi layer technique, which Tapio Wirkkala used in Rosenthal. Artistic vessels in flashed glass, as this technique is called were already precious in ancient Rome. A thin layer of different colored glass is fused onto clear or light glass. The layers are firmly bonded together and do not separate from each other.