The name of the manufacturer ''indoor'' and the model ''delamp'' are stamped on the base of each table lamp. This desk/table lamp is Rob Wermenbol‘s most famous lamp. Wermenbol studied at the international university of applied sciences for Fine Arts and Design, the Gerrit Rietveld Academy from 1974 until 1979. He worked for Indoor from 1979 until 1989. He was responsible for design, engineering, production/organisation of a collection of light fixtures in metal and plastic. The manufacturer Indoor B.V. was at least active since the beginning of the 1960s. Mister Cohen was the president. They had their offices and expedition at the Sloterkade street and a shop at the famous Paulus Potterstraat 22-24 in Amsterdam in front of the Van Gogh museum. 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, European Plug (up to 250V).The wiring of this item may be original and might need replacement, if not specified otherwise.