JIAQING SIX-CHARACTER SEAL MARK IN UNDERGLAZE BLUE AND OF THE PERIOD (1796-1820)

Jiaqing examples with this decoration appear to be particularly rare, a pair of Qianlong examples from the T. Y Chao Collection are illustrated in Catalogue of Ch'ing Porcelain from The Wah Kwong Collection, Chinese University of Hong Kong, 1973, no.41.