Smoked glass snuffbox painted on the inside with a portrait of the monk Yi Xing 一行, One Bottle Studio, China, 20th century Of flattened rectangular form with rounded shoulders, painted on one side with a portrait of the monk Yi Xing, a mathematician and Buddhist monk who lived during the Tang dynasty, and the inscription: 僧一行, 本名張遂唐代, 著名天文學家 which can be translated as: "Monk Yixing, his birth name is Zhang Sui, Tang dynasty, famous astronomer". Followed by the Ji seal. The other side features a sparrow on a rock amidst flowers. Purple and brown chalcedony stopper. Height: 5.9 cm The Ji seal (an abbreviated form of the character meaning Hebei province) was used by Wang Xisan when he worked at Hengshui's One Bottle Studio.