This elegant large midcentury wall light was designed and manufactured in germany in the 1960s by gebruder cosack. It is made of brass and is adjustable. The lamp is in full working order and ready for use in us, asia and europe and requires a e27 screw on bulb. Diameter of backplate is 3.35 inch (8.5 cm). It is in excellent condition. 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.