A SMALL PALE GREEN JADE DISC, BISong Dynasty or laterCarved on both sides with evenly spaced spiral 'grain' bosses in relief between two raised bands at the inner and outer edges.4.7cm (1 7/8in) diam.Provenance: 宋或以後 穀紋小玉璧For a similar small jade disc dated to the Song dynasty based on an archaic prototype,pare to one sold at Christie's Hong Kong, 31 May 2017, lot 2735.見香港佳士得2017年5月31日售一件宋代褐玉環，拍品2735。