QIANLONG CYCLICAL GENGYIN YEAR CORRESPONDING TO 1770 AND OF THE PERIOD

The reverse with gilt-filled inscription and 'Qian' 'Long' seal marks.

Compare with a very similar zitan table screen also with inscription on the wooden backplate, in the Harvard Art Museum, object number: 1942.185.280, illustrated in Jenny So, Early Chinese Jades in the Harvard Art Museums, Cambridge, 2019, p 281, pl. 38B.