DAOGUANG SIX-CHARACTER SEAL MARK IN IRON-RED AND OF THE PERIOD (1821-1850)

Compare to a similar example, see the collection of the Beijing Palace Museum, illustrated in The Complete Collection of Treasures of the Palace Museum, Porcelains with Cloisonné Enamel Decoration and Famille Rose, vol. 39, Hong Kong, 1999, p. 217, no. 192.