Ming Dynasty, 1368-1644 AD. A tongue-shaped slate panel with incised 11 x 15 square grid to one face; short title in larger characters to the rounded top, a character in most squares of the grid; column of lighter-incised characters above the lower edge with short spur. 6.5kg, 56cm (22"). From the Cheuk family collection, Hong Kong, 1980s. [] Fine condition.