KANGXI SIX-CHARACTER MARK IN UNDERGLAZE BLUE IN A DOUBLE CIRCLE AND OF THE PERIOD (1662-1722)

Compare the enamel colours and decoration of this cup to a Yongzheng mark and period bottle vase in the Sir Percival David Collection, British Museum, PDF 823, published and illustrated in Krahl, Regina; Harrison-Hall, Jessica, Chinese Ceramics: Highlights of the Sir Percival David Collection, London, BMP, 2009, p. 81, no. 4.