The lamp is designed in the style of a "Banker's lamp" or "Minister's lamp". Materials: The base and body are made of brass, and the shade is made of green glass, often called "cobalt" or "opale" glass. Features: The fixture has an adjustable height and tilt of the shade. Provenance: Similar lighting fixtures often date from the first half of the 20th century, approximately from the 1920s to the 1930s.