Ichikawa Seisakusho Co., Ltd., Nagoya, 1952
市川製作所
Ichikawa Seisakusho is listed both in the "Century of Japanese Motorcycles" and in the "Nagoya Motorcycle Kingdom" (名古屋オートバイ王国) as having existed in 1952. They, like many other small companies, assembled machines using engines provided by some other manufacturer and in the Nagoya Motorcycle Kingdom it estimates that perhaps 1000 were made in total. The model they produced was called the Derby (ダービー号) and while I'm assuming that it was a moped of some sort, nothing else is known about them at this time.