Black-glazed cup of Jizhou kiln with plum blossom pattern of Southern Song Dynasty

The cup is 5.5cm in height, 11.4cm in diameter, 3.7cm in foot diameter and 0.18kg in weight. The cup has an open mouth, and a round foot. It is decorated with a bow-string pattern near the mouth, and a pattern of plum flowers is casted in the inner wall of the vessel. Black glaze covers the inner and outer walls of the cup.