The mask is of an older male with long white beard expressing wisdom.
The Okina mask takes its origin from the traditional Genryu style of
Noh play called "Dance of Monkeys" and it features movable jaw & eyebrows.
Kokushiki-jo
Kokushiji-jo is one of Okina group masks featuring its black face as well as movable jaw. It is used only for the very end of a specific play "Sanba-so". Sanba-so dance is a prayer for an abundant harvest.