Ca. First quarter 20thC. Excellent with all filters intact, no cracks or breaks. Simple wire to lamp socket should be replaced if you want to use this device. Some info: Dinshah Ghadiali honorary M.D., M.E., D.C., Ph.D., L.L.D., D. O.P.T., N.D., L.M.N.O.P. invented the Spectro-Chrome Metry machine. As the chairman of the self-created Electro-Medical Hall, he certified that the device unlocked the medical secrets of using light to cure all sorts of diseases and afflictions. Ghadiali was born in Bombay, India, in 1873. He served as an assistant to the Professor of Mathematics and Science at the nearby Wilson College. He reached a turning point in his medical career when he treated a friends niece. The story goes that traditional music had failed her, but Ghadiali had an alternative treatment in mind. He filtered the light of a kerosene lantern through indigo-colored glass, shining it on her. He also put milk in a blue bottle and let it sit in the sun, absorbing light. Allegedly, she was back on her feet in just three days. This medical success put Ghadiali on a path to discover the secrets of chromopathy healing with light. By 1920, Ghadiali was ready to show his invention to the world. He began marketing his Spectro-Chrome box in New York. Establishing the Electro-Medical Hall, he trained an estimated 800 health professionals to use colored light to treat peoples medical conditions.