By Kogyokusai, 19th centuryOf lenticular form, bearing a kinji ground, lacquered and inlaid with performers in the play Okina, one wearing a pale Hakushiki-jo mask, the other a Kokushiki-jo mask, in gold and slight-coloured takamakie, the masks of ivory and dark horn and the interior of nashiji, signed Kogyokusai; with ivory ojime of oni and hyottoko masks. 8.5cm (3 3/8in).