Maybe this is old stuff and if so, I apologize. But there is an interesting site for the Japanese Bicycle History Research Club:
http://www.eva.hi-ho.ne.jp/
The club holds a concours called Ploy Japan, where they break out their vintage steel. Bikes from the 2001 show can be seen at:
http://www.eva.hi-ho.ne.jp/
Bryant Bainbridge
Portland Orygun