Original vintage British industrial electrical warning sign reading DANGER 33,000 VOLT LINE. This heavy enamel-on-steel sign dates to the early-mid 20th century and was used on high-voltage power infrastructure such as substations, transformer housings, or industrial electrical installations. The sign features raised lettering, original enamel paint, and large mounting holes. An attached metal identification plate marked “AG 85″ remains affixed with original bolts, adding to its authenticity and historical interest. Surface wear, enamel loss, corrosion, and grime are consistent with real-world industrial use and age. An outstanding piece of early electrical and industrial history-ideal for collectors, display, or industrial décor. Significant wear throughout including enamel loss, rust, scratches, edge corrosion, and discoloration. Original mounting bolts present. Please review all photos carefully. Material: Enamel-coated steel. Era: Circa 1920s-1940s. Origin: United Kingdom. Voltage: 33,000 volts. Size: Approx. 14-16″ x 10-12″ (main sign). Original vintage piece, not a reproduction.