Square cassette with a sliding lid in the shape of a Mahjong piece. Mahjong is a game which is very popular in China. Inside the cassette are two small seals with engraved bamboo. Both cassette and seals are made of celluloid, a material which was very popular during the Republic period (1912 - 1947). Cassette: Length 3.1 cm. Width 2.2 cm. Height 1.7 cm.