QIANLONG SIX-CHARACTER SEAL MARK IN UNDERGLAZE BLUE AND OF THE PERIOD (1736-1795)

There are a number of blue-glazed vases decorated with gilt in the Palace Museum, Beijing; see one example also with an underglaze blue seal mark illustrated in The Complete Collection of Treasures of the Palace Museum - 37 - Monochrome Porcelain, Hong Kong, 1999, no. 86, and two further examples with iron-red seal marks, ibid., nos. 75 and 76.