Ikora art glass was developed by Karl Wiedmann and manufactured by the Württembergische Metallwarenfabrik (WMF) company in Germany during the period of 1926 - 1954. The internal decoration was made possible by using powdered glass of different colors encased in crystal. The use of silver salts and chloride created the trademark bubbles of various sizes and shapes. Most Ikora glass was manufactured before World War II. The diameter of this piece is 10 3/4 inches.