YONGZHENG SIX-CHARACTER MARK IN UNDERGLAZE BLUE WITHIN A DOUBLE CIRCLE AND OF THE PERIOD (1723-1735)

A bowl of this pattern and size is illustrated in The Tsui Museum of Art, Hong Kong, 1991, no. 93, and another is illustrated by R. Krahl, Chinese Ceramics from the Meiyintang Collection, vol. 2, London, 1994, no. 842.