This sterling pin by Spies says "Sixty KW Booster" and has a bas relief vacuum tube on the front with "CE Co". So, which electric company had a "Sixty Kilowatt Booster" promo? Any ideas?
It could also be Chicago Edison Company. The president of that company in 1892 was Samuel Insull. In 1897, he incorporated Commonwealth Electric Light & Power Co. In 1907, his two companies merged to create the present day Commonwealth Edison Company.
This guy had his hands in everything that powered Chicagoland, from electric/gas utilities to almost every railroad, even radio stations (KYW was Chicago's first radio station in 1921).
His "approach made him an innovator in the use of technologies, financial instruments, rate structures, and promotional campaigns to create a mass market for electric light and power." :
Being that Spies Bros. is a Chicago jeweler, it's a good possibility that "CE" is Comm. Ed. or Chicago Edison...it could be a promo from his electric company or radio station.