Okochi Ironworks Co., Ltd., Yoshinobu Town, Hamamatsu City, 1953-55
This one is a bit confusing as I don't understand why "BIC Motor" is in the corner of the ad. Perhaps they supplied the engine ? After a lot of sleuthing I managed to find what I'd consider to be an authortative reference in the Hamamatsu City Central Library at this link where some detail on the early motorcycle history for the area is given. According to the Hamamatsu City Cultural Heritage Digital Archive, Okochi Ironworks made a 90cc 4 stroke machine called the 'Silver Bell' (シルバーベル号).