Rocket Co., Ltd., Motohama Town, Hamamatsu City, 1950-60
The Rocket Company produced a line of machines under the Queen Rocket (クインロケット号) brand name, using engines made by other manufacturers. Early engines were possibly made by Mitsubishi Heavy Industries, with the 200R model released in 1958 having an engine made by Enomura Iron Works (榎村鉄工所) and was supposedly Zundapp copy (per Yaplog) and the 1958 125R using a Hodaka (穂高工業所) engine. Engines were single cylinder 2 strokes, with displacements ranging from 125cc through to 249cc.
And from YouTube, a video of one being ridden !