Clear Rio brown glass with geometrical and abstract patterns and stem and fitments in patinated brass.
Reference: "the Brilliance of Swedish Glass, 1918 - 1939", by Anne-Marie Ericsson, Märta Holkers, Nina Stritzler-Levine, Clarence Burton Sheffield,Jr..., published in the year 1997. Text and descriptions by Gunnel Holmér pages 106 and 107. A version of this ceiling lamp is shown in Fig. 7-9 in page 107, from the Orrefors production catalogue in the year 1937.
Produced by Orrefors.