My earliest English language Shimano catalogue dates from 1972 and my earliest English language SunTour catalogue from 1973, so this, 1971, edition of Japan's Bicycle Guide provides a sliver of, much needed, additional information.
It is a classy, high quality, production - reflecting the growing aspirations and confidence of the Japanese bicycle industry. The artily marbled cover is extremely subtly embossed with the words 'Japan's Bicycle Guide' and is decorated with an image of a mask that I would ignorantly guess is something meaningful from Noh drama. This is a publication conceived to promote Japan as sophisticated, cultured and world-class, it is not a publication designed to sell on price alone.
The most interesting derailleurs shown are: