Kofu was a Tokyo based company that manufactured bicycles under the Wind, Kofu and Kenko brands. Effective 1970, they merged with the Zebra company, which dated back to 1901. The new company was called Zebra-Kenko, producing bicycles under the eponymous Zebrakenko brand. These were quite widely distributed in the USA from about 1975-1984.

In 1976 Zebra-kenko was acquired by Okamoto Rikken Rubber Co., a rubber goods manufacture with history dating back to 1934 and whose original products were condoms. Okamoto would absorb at least one other bicycle compny, Foyu, in 1981, before changing it's name to Okamoto Industries Inc. in 1985. This was also the year that the bicycles resorted to the Zebra branding in the USA. Bicycle distribution in the USA appears to have ceased sometime in the very late 1980s.

The Okamato coporation continued to grow, absorbing variopus companies. It currently has nine production facilities in five countries, including the one in Sandusky Ohio, where they manufacture parts for automobile interiors. Bicycles no longer appear to be part of Okamoto's business.

It can be challenging sourcing parts for pre-boom era Japanese bicycles, as they were not widely distributed in the USA at that time. A lot of them also had eponymously branded parts, making things even more difficult. However, some parts, like the shift lever, should have more generic, coming from a manufacturer like Shimano.

I'd appreciate photographs of your bicycle. Please ignore the warning of needing 10 posts. Photos will not attach to the post but they will upload to a gallery album were members can view them.

Have you considered typing you advertment into Google Transalate and letting the application perform the translation, which you can then cut and paste? It's not perfect grammatically but it should at least be understandable to Japanese readers.