18th century The straight sides carved with various craggy mountains surrounded by crashing waves beneath key-fret border, the flat cover carved in low-relief with five archaic characters representing the Five Holy Mountains, the underside of the cover carved with a further four characters wu yue si du, between writhing chilong, the stone of even pale green tone with milky white inclusions, huanghuali stand. 8.5cm (3 3/8in) wide (3).