The wall light has a bayonet socket and is designed for use with a Cornalux bulb. This reflects the designer's intention. The small arm allows the bulb to be adjusted in all directions. 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.