Lot 68. A jade arc-shaped 'animal mask' ornament, Eastern Zhou dynasty, Spring and Autumn period (770-475 BC); 6.3 by 5.3 cm, 2 ½ by 2 ⅛ in . Estimate: 240,000 - 300,000 HKD . Courtesy Sotheby's. the convex surface divided into two registers with a raised...