Fuji Industry Co., Ltd., Nagoya City, Higashi-ku, 1952-58
富士工業株式会社
Not a lot of information about this company, but Fuji Industry made lightweight machines, supposedly of their own design ranging from 123cc to 147cc using ohv 4 stroke engines. The brand was called the Silver Star (シルバースター号). The Japanese Wikipedia lists another model called the White Eagle (ホワイトイーグル号) but I have yet to find any examples of that.
Note that the Japanese Wikipedia lists a company called Silver Star Motors (銀星モータース) which is shown as making a model also called the Silver Star (シルバースター号). At the moment, I'm not sure whether that is an error, or in fact a different company.