The first edition Nitto kits are referred
to as the "long box" or "white box"
series (1966-1971).
Followed by this "yellow box"(1975-1977),
the "blue box"(1978-1979)
and the "red box"(1980) series.
In the early eighties, there was one more release.
First Edition Walking Gyaos
Art No. 78-200
Nitto Walking Gyaos
498-300
Many thanks to World
of Puramo for
images and wealth of information