A WHITE JADE 'INVERTED-CUP-FORM' SEALMING DYNASTY (1368-1644)Seal face: 'LE QIN SHU YI ZI SHI' Inscription: 'LE QIN SHU YI ZI SHI'L 7.2 cm (2 7/8 in) ESTIMATE: HKD 30,000 / RMB 26,400