A RARE PAIR CLOISONNÉ ENAMEL 'PIGEON' INCENSE BURNERS AND COVERSQianlong Each finely modelled in the form of a pigeon, the feathers delicately enamelled in blue, turquoise, and green, with slight variation in colours of the two 'birds' near the 'belly', in the wings and the tail, the eyes inset with amber and red glass beads, the wings and back forming a detachable cover. Each 18.5cm (7 1/4) long. (4). 清乾隆 銅胎掐絲琺瑯鴿形蓋爐一對 Provenance : Sir Michael Oppenheimer (3rd Baronet, 1924-2020) and Lady Helen Oppenheimer DD (1926-2022), and thence by descent 來源 ：Michael Oppenheimer 爵士（三代從男爵，1924-2020年）與Helen Oppenheimer爵士夫人（1926-2022年）舊藏，並由後人保存迄今 The collection belonged to Sir Michael and Lady Oppenheimer DD (3rd Baronet, 1924-2020). Sir Michael's maternal grandparents were Sir Robert Grenville Harvey, 2nd Baronet (1856-1931) and Lady Emily Blanche Harvey (1872-1935) of Langley Park, Buckinghamshire. The Chinese art collection can be, at least in part, traced back to Langley Park, Buckinghamshire, home to the Harvey Baronets from 1788 until 1945, as demonstrated in a pre-1945 photograph showing Lot 122, the cloisonné enamel tripod 'elephant' incense burner, Qianlong. Sir Michael Oppenheimer's paternal family was the well-known South African mining family. The baronetcy was created in 1921 for Bernard Oppenheimer, Chairman of the South African Diamond Corporation for setting up diamond sorting factories to employ wounded ex-servicemen after the First World War. The family has been involved with De Beers over many decades. Lady Oppenheimer DD (1926-2022) was a distinguished moral and philosophical theologian, with a particular interest in the ethics pertaining to personal relations. pare with a very similar cloisonné enamel incense burner in the shape of a dove, Qianlong, in the Musée des Arts Décoratifs, illustrated by B.Quette, Cloisonné: Chinese Enamels from the Yuan, Ming and Qing Dynasties , New York and Paris, 2011, no.110. See also a related pair of bird-shaped cloisonné enamel incense burners and covers, second half 18th century, illustrated by H.Brinker and A.Lutz, Chinese Cloisonné: The Pierre Uldry Collection , London, 1989, no.328. See a single similar cloisonné enamel 'pigeon' incense burner and cover, Qianlong, which was sold at Christie's New York, 22 March 2013, lot 1187; and another single similar example which was sold at Christie's London, 8 November 2016, lot 125.