Made in czechoslovakia made of glass the pendant is equipped with a new electrical installation 1xe27 or e26 bulb us wiring compact. In perfect original condition never used, we send it in original boxes. We have old stock from old bohemia glass factory all never used and in original boxes. Height is adjustable 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.