Design by Prof. Michael Boehm for Rosenthal, Germany, 1970s. Imposing heavy, hand-crafted glass ball with sulfur glass bubbles, etched stamp "Rosenthal Glas-Studio" on the underside and hand-signed "Michael Boehm, 325-7/20". Rare, unusual piece in very good condition, except for a delicate, long scratch on the top and minor small scratches on the base. Weight: 2350g This piece has an attribution mark, I am sure that it is completely authentic and take full responsibility for any authenticity issues arising from misattribution