Manufacturer: Unknown
User: General Controls
Date of mug: unknown

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Notes: General Controls was a manufacturer of automatic, pressure, temperature and flow controls, located at 801 Allen Avenue in Glendale, Calif.

From a timeline (see image above) provided by its current iteration, GC Valves in Charlotte, N.C.:
1930s – General Controls is founded by combustion controls pioneers Jack and Bill Ray.
1940s – General Controls expands production to support the World War II manufacturing effort.
"1950s – General Controls sees sustained growth in General Purpose Solenoid Valve product lines.
"1960s – ITT acquires General Controls. …

The mug has a broad burgundy red band beginning at the rim and underneath is the General Controls crest, with G and C divided diagonally by symbols, with a lightning bolt in the center.

Source:
GC Valves

Contributors:
Keith Marantz: mug photo
Roland Burritt: ID
Ed Babcock: ephemera