Previously sold at Sotheby's Hong Kong, 28 April 1992, lot 169.

Compare with a single Daoguang bowl of this size and pattern from the Yangzhitang Collection, sold at Chrstie's Singapore, 30 March 1997, lot 385; and an identical pair of bowls with Daoguang sealmarks sold at Christie's London, 17 January 1989, lot 775.