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See chapter on House Brands.

This trademark has been identified as a House Brand of Sears, Roebuck and Company between 1914 to 1941. Instruments produced by various (probably) Chicago-based manufacturers, especially Harmony (then a Sears subsidiary). Sears used the Supertone trademark on a full range of guitars, lap steels, banjos, mandolins, ukuleles, and amplifiers.
In 1940, then-company president Jay Krause bought Harmony from Sears by acquiring the controlling stock, and continued to expand the company's production. By 1941, Sears had retired the Supertone trademark in favor of the new Silvertone name. Harmony, though a separate business entity, still sold guitars to Sears for sale under this new brand name (source: Michael Wright, Vintage Guitar Magazine).