These are the Japanese riders who ventured around the circuits as members of the Yamaha Racing Team in the very beginning.
This is a beautiful picture of the men who made the Yamaha name known in the world in those early 1960's:
Fumio Ito, Hideo Ohishi, Taneharu Noguchi, Hiroshi Hasegawa and Sunako. You can click for a large format picture.
I will try to find out the "where and what" of this picture!