See p. ?? of the introduction of this catalogue for a discussion of these dishes where it is explained that these are probably ceremonial dishes produced in the first year of the reign of the Emperor Xianfeng, fourth son of Daoguang.
The Chinese University of Hong Kong, Imperial Porcelain of Late Qing, Kwan Collection, 1983, Catalogue, no. 24
National Museum of History, Taipei, Imperial Porcelain of late Ch'ing, From the Kwan Collection, 1985, Catalogue, no. 24