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

Compare the very similar bowl and cover, but with Guangxu mark, illustrated in Imperial Porcelain of Late Qing from the Kwan Collection, Art Gallery, The Chinese University of Hong Kong, 13 August - 25 September 1983, p. 131, no. 137.