E27 / e26 excluding light bulb and ceiling canopy all lamps have been made suitable by international standards for incandescent light bulbs, energy-efficient and led bulbs. E26/e27 bulb holders and new wiring are ce certified or ul listed. this piece is attributed to the mentioned designer/maker. It has no attribution mark and no official proof of authenticity, however it is well documented in design history. I take full responsibility for any authenticity issues arising from misattribution, up to 250v (europe/uk standard).the wiring of this item may be original and might need replacement, if not specified otherwise.