Bertil Brisborg, a ceiling lamp, Nordiska Kompaniet, Sweden 1940's/50's.
Brass and glass with etched rhombus decoration. For one light source. Diameter 50, height 92 cm.
Electrical function not tested. Small chips and marks. Possibly a later brass stem. Some wear and stains.
Compare images of the same model of dome from NK's archive, 1950s.