The Rosdala Glassworks in Norrhult, Småland, Sweden, was founded in 1895. The glassworks has a strong focus on utility glass, particularly lamp glass. It was established by Oskar Carlström and Karl Peterson. The glassworks operated between 1895-1998. 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, European Plug (up to 250V).The wiring of this item may be original and might need replacement, if not specified otherwise.