Qianlong incised yu yong four-character mark and of the periodCarved to the convex front side with an archaistic bird's head above key-fret scroll on the longer tab, the shorter tab carved with a narrow slit, the concave reverse incised with the four-character mark above a three-character inscription, the translucent stone of an even white tone, box. 5.8cm (2 1/4in) long (2).