Voice was a brand name of the Japanese Iwase Electronic Company Ltd. The company was founded in 1965 by Mr Iwase (born 1931 in Tokyo) who had previously worked for Teisco. Iwase Electronic Co. made amplifiers and guitars until 1970. While the amplifiers were factory made, Voice guitars were handmade by Mr Iwase himself who built around 300 in total.

Source: Electric Deer Guitarworks - Voice Guitars (21 June 2021)