The piece comes from Czechoslovakia from the 1930s. The item has been restored, the rim is enamelled with spray lacquer, the bakelite plate is cleaned, and the glass is colored in the mass. Originally, a ceiling lamp for interior fittings of public buildings. 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.