DAOGUANG SIX-CHARACTER SEAL MARK IN UNDERGLAZE-BLUE AND OF THE PERIOD (1821-1850)

See an earlier Qianlong mark and period (1736-1795) bowl of this design in the Percival David Collection at the British Museum, illustrated by Margaret Medley, Oriental Ceramics: The World's Great Collections vol. 6, Tokyo, 1982, pl. 94. Daoguang examples include one illustrated by S. Valenstein, A Handbook of Chinese Ceramics, New York, 1989 ed., p. 273, no. 282; and a pair of bowls from the E.T. Chow Collection sold at Christie's London, 12 November 2002, lot 62.