Lot 2039A Yixing 'robin's egg'-enameled faceted teapot and cover, 18th century; 7½ in. (19 cm.) highEstimate USD 10,000 - USD 12,000. Price Realized USD 50,000. © Christie's Images Ltd 2014. 

The square body of the teapot tapers gently to the mouth rim, and has a loop handle on one side and a small curved spout on the other. The square, domed cover is surmounted by a loop handle and pierced with a small vent hole. The exterior and base are covered with a finely mottled turquoise and blue glaze that covers a faint seal mark, inscribed Ling Wanquan zhi (made by Ling Wanquan) on the base.

Provenance: Sotheby's London, 10 December 1985, lot 267.

Note: Compare a similarly enameled and slightly larger teapot of the same shape, but bearing the raised mark, Jingxi Ling Wanyu zhi (Made by Ling Wanyu, Jingxi [Yixing]), sold at Sotheby's Hong Kong, 27 October 1992, lot 90. 

Teapots of this square shape were thought to have been an innovation of the Kangxi period potter, Hua Fengxiang, whose inspiration of this form was from archaic bronze square-shaped vessels known as fanghu, discussed by K.S. Lo in The Stonewares of Yixing: From the Ming Period to the Present Day, Hong Kong, 1986. Although the shape existed in the Kangxi period, it was not until the Yongzheng period that 'robin's-egg'-enamel was used on Yixing wares. For a teapot with Robin's egg glaze of the square shape and dated late 18th century, see K. S. Lo Collection in the Flagstaff House Museum of Tea Ware, Part2, HK, 1984, p.138, no. 129.

Christie's. Fine Chinese Ceramics and Works of Art, New York, 20 - 21 March 2014