明或更早

Compare the present lot with a plaque of similar form, from the collection of Mr. David R. S. Ezekiel, illustrated by Basil Gray, Jessica Rawson and John Ayers in "Chinese Jade Throughout the Ages", Victoria and Albert Museum Exhibition, 1 May-22 June 1975, Transactions of the Oriental Ceramic Society, Volume 40, 1973-1975, p. 94, no. 301.