Electric light bulb; three pin socketed onto base, with connection wiring visible in copper alloy frame, under glass enclosure. Glass enclosure contains tungsten filament which runs form base to top. Also has 'criss cross' wire around glass. Manufactured by Edison & Swan United Electric Light Co Ltd.

The Edison and Swan Electric Light Company Limited was a manufacturer of electrical goods based in London, England. It was founded by chemist and inventor Sir Joseph Wilson Swan (1828-1914) on 26 October 1883.

In 1860, Swan began conducting experiments in electric lighting. After several setbacks, Swan successfully produced an incandescent electric lamp in 1878, which he patented on 27 November 1880 (Patent No. 4933). After setting up the Swan United Electric Company to commercially produce the lamp, Swan was threatened with legal action by the rival Edison Electric Light Company, who claimed infringement of the patents taken out by American inventor and scientist Thomas Edison (1847-1931). Instead of going to trial, the two companies agreed to merge, becoming the Edison and Swan United Electric Light Company Limited in 1883. By combining forces, the Company was able to suppress competition in Britain and dominate the market with their ‘Ediswan’ light bulbs, produced in factories in Sunderland, Brimsdown, and Ponders End.