Firstman was a Japanese guitar and amplifier company founded in 1967 by Kazuo Morioka, an ex Teisco employee. Firstman also had an licensing agreement with Semi Mosely to produce Japanese Mosrites. The Firstman branded guitars lasted until 1969 and the company eventually became Mosrite Japan in the early 1970s.

Source: 1968 Firstman and Mosrite Japanese catalog

Source: Drowing in guitars- Firstman Broadway guitar (12 May 2017)