Compare this very rare 'duck' censer with an identical pair illustrated in H. Brinker and A. Lutz, Chinesisches Cloisonné - Die Sammlung Pierre Uldry, Museum Rietberg, Zurich 1985, pl.220. Also from the Pierre Uldry collection is an identical stand illustrated in Op. Cit., pl.219.
See also another pair of duck-form censer identical to the present lot sold at Sotheby's London, 21 June 1983, lot 17.
A 'duck' censer from the first half of the 17th century, without the stand, is illustrated in Sir H. Garner, Chinese and Japanese Cloisonné Enamels, London 1962, pl.58A. The author mentions other Ming ducks 'generally mounted on square or rhomboidal bases (...)'.