Paramus, New Jersey, USA
The Keystone Company was founded in 1919 as a toy manufacturer. By the mid-30s it had started manufacturing cameras, and by 1945 was producing a range of movie cameras and projectors and was phasing out of the toy business. The company continued to be very innovative in photographic equipment and in other consumer goods.
In 1965 Keystone was purchased by Berkey Photo Inc., which owned the Omega trade mark. See also Atlas-Rand.
Source : Vintage Calculators Web Museum