Diameter base: 18 cm Width approx. 44 cm (arm length) Shade width: 26 cm Shade length: 27 cm Shade height: 12 cm The switch is located on the base. I have official proof of authenticity such as vintage catalogs, designer records, or other literature sources 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.