Here are 4 very rare books published by the Hakko Ryu main dojo in Japan. These books were only sold to members and there were 4 books in the series:
Yellow book - 1st dan level
Blue book - 2nd dan level
Red book - 3rd dan level
Green book - 4th dan level
The books are all in Japanese and include many photos showing jujutsu techniques.
They were printed in the years 1980, 1982, 1979 & 1981.
Also included in this lot is a 4th dan certificate from the previous owner of these books.
About Hakko Ryu:
Hakko Ryu jujutsu was founded by Ryuho Okuyama who was a student of Sokaku Takeda (of Daito Ryu Aikijujutsu) in 1941. There is very little about their techniques shown publicly in book or video form.