This is a vintage Tiffany-style slag glass hanging lamp medium tulip

Slag glass is an opaque, pressed glass characterized by rich, marbled swirls created by adding iron slag or other minerals to molten glass. It features a tulip or lotus blossom shape composed of curved glass panels. The panels are often held together by decorative metal flourishes, frequently made of brass or bronze-patinated metal. These are typically found as "swag lamps, " which use a long decorative chain and an electrical cord that plugs directly into a wall outlet rather than requiring hard-wiring.

Slag glass lamps originated in the late 19th century, produced by prominent firms like. Many tulip-shaped hanging lamps found today are 1970s-era reproductions or "Tiffany-style" pieces. While many were mass-produced without signatures, similar designs have been attributed to manufacturers such as.

Check the top "crown" of the shade or near the socket for stamps like "EF Industries" or "Miller". A magnet will not stick to solid brass but will stick to brass-plated steel or iron. Older 1970s plugs often have larger plastic casings, while 1960s plugs may have a more distinctive head shape.