An ivory netsuke of seven noh masks.
Signed Masahiro. Osaka School
The artist is a pupil of Ohara Mitsuhiro (1810-1875), also known as Ryuchokusai.
Mid - Late 19th century
"Masahiro-  called himself Ryuchokusai.  Osaka school, Mid. 19th century.  One of the foremost pupils of Mitsuhiro who carved much in his master's style." (p.704 ' How to Read their Signatures', by GL)

七能面牙彫根付　銘　正廣