Sanno Auto Industry Co. Ltd
山王自動車工業 Previously known as Yamato Shokai Co. Ltd. (ヤマト商会), the company evidently started out as a repair company servicing Honda's. In 1953 they started production of the 'Lucky' line of motorcycles, which were offered in 125cc (the FA and the FG) and 200cc variants (FB). All were 2 stroke machines, and the FG version appears to have been a plunger rear suspension They ceased trading in 1958.
In 'Japan's Motorcycle Wars' the manufacturer is referenced as being 'Daiwa' for some reason which is not supported by other texts.