JIAQING SIX-CHARACTER SEAL MARK IN IRON-RED AND OF THE PERIOD (1796-1820)

For an almost identical censer, see Gunhild Avitabile, Vom Schatz der Drachen [From the Dragons Treasure], 1987, col. plate 5, p. 22.

A similarly-formed censer but with a pink ground sold at Christie's South Kensington, 11 November 2015, lot 682.