Nippon Motor Co. 1958 ?
日本発動機 The rapid churn with the smaller companies makes them difficult to follow, but the Nippon Motor company started production of a scooter previously built by 'Sanko Kogyo' (a spin-off from the Nakajima aircraft company) who went out of business in 1955. Production continued for a short time under a company called 'Sankar Manufacturing Inc' before being taken over in 1957 by the current producer.
The 'Coaster Jet 200cc uses a side valve fan cooled engine, with centrifugal clutch and v-belt drive. Top speed was listed as 70 kph.