Unitron is a US-based company and distributor of optical instruments including stereo microscopes and accessories, binoculars, and classic brass telescopes.
Several of the 6" Model 620's remain operational at observatories to include: Rafes Urban Astronomy Center, Denton, Texas; Castleton State College, Castleton, Vermont, Ferris State University, Big Rapids, Michigan, and the University of Connecticut, Storrs, Connecticut.
[5] He and his wife Ellen were killed in a private airplane crash in Canada on 3 August 1978 and much of the early history of the company was lost.
The Unitron as well as Polarex and lesser-known Weltblick telescopes were all manufactured by Nihon Seiko until that trading company went out of business in 1992.
The telescopes (which included 1.6" to 9" refractors) were noted for their high quality specifications and metal and wood construction.