A Rare Shang Dynasty Jade Cong, c.1550-1030 BC, the calcified green jade with two square sections and circular central aperture, China, 12 x 9 cm Provenance: From the collection of a Hong Kong resident Note: For further information regarding these artefacts c.f: Rawson J. 1995, Chinese Jade From the Neolithic to Qing, Exhibition Catalogue, The British Museum, London.