All of a sudden I found these pictures from the "Japan Grand Prix"

But unfortunately I do not know the year....!

On the first page you see Bill Ivy "roaring around the bend" as it says. His machine is a 125 (black number plate). Bill won the 125 cc class. Bill was followed by cameramen everywhere! On the bottom picture Hasegawa and Ivy are both on 250 cc Yamaha's. The 250 cc class was won by Ralph Bryans (Honda) and the 50 cc class by Mitsuo Ito (Suzuki).

Japanese G.P. 1967