It is extremely rare to find Yongzheng-marked vases of this size and shape. Compare the considerably smaller (31.5 cm. high) Qianlong-marked vase from the T.Y. Chao Private and Family Trust Collection sold in these Rooms, 31 March 1992, lot 5776 and another trefoil version included in the National Palace Museum, Special Exhibition of Kangxi, Yongzheng and Qianlong Porcelain, Catalogue, p. 132, col. pl. 105.
Henry Dasson (1825-1896) was an important furniture maker especially well known for employing the finest of ormolu mounts with high quality mercurial gilding and for his remarkable copies of the famous Louis XV bureau. In 1889, he received a 'Grand Prix Artistique' for a high profile exhibition of Louis XIV, XV and XVI style pieces. He used a script signature on mounts. In all recorded cases the Christian name is spelt with a 'y' at the end and the metalwork almost always incorporates a date after the signature. For more on Dasson, see Denise Ledoux-Lebard, Le Mobilier Francais du XIXe Siecle, 1989, Paris, and Christopher Payne, 19th Century European Furniture, 1985, Woodbridge.