General Electric Model 7H86 "Warburton"
This circa 1939 General Electric clock, the model
7H86, was known as the "Warburton". The case is made of Catalin,
and was available in tortoise, as seen here, or alabaster (now yellow).
Another version had a gray case, with a silver face and a chrome bezel.
The Warburton seems to be one of the harder GE/Telechron Catalin clocks
The face was a sheet of plastic embossed with a wavy line pattern giving it an iridescent appearance, which the manufacturer called "Enameloid".