The structure is composed of a metal base, a transparent blown glass outer sphere, and an opal glass inner sphere that diffuses a soft, even light. The upper part is shaped like a hemisphere. There are two versions, small and large; ours is the large one. 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.