Sanko Kogyo Co., Ltd., Hachioji, Tokyo, 1953-55(?)
三光工業株式会社
Sanko Kogyo made a line of 2 stroke scooters in various sizes as designated by the model number: so far I've found a J3, J4, J5, J6 and J7. The brand was marketed as the Jet Scooter (ジェットスクーター).
