The hallmark found on this ewer is associated with porcelains produced during the Qianlong period, as noted in Geng Baochang, Ming Qing Ciqi Jianding
[Connoisseurship of Ming and Qing Porcelains], Hong Kong, 1993, p. 383. Compare a similar wine warmer with a Yongzheng mark in the Metropolitan Museum of Art, New York, illustrated in Warren E. Cox, The Book of Pottery and Porcelain
, vol. II, New York, 1949, pl. 164, fig. 872. Another, in the Royal Ontario Museum, Toronto, is inscribed with a Caihua tang zhi
('Hall of Brilliant Splendor') mark, acc. no. 911.8.60A-C. A third example, inscribed with a Yanghe tang zhi
('Hall for Cultivating Harmony'), in the collection of the Seikadō Bunko Art Museum in Tokyo, is illustrated in Seikadō zō Shinchō tōji. Keitokuchin kanyō no bi
[Qing dynasty porcelain collected in the Seikadō. Beauty of Jingdezhen imperial kilns], Seikadō Bunko Art Museum, Tokyo, 2006, cat. no. 41. See also an example sold at Christie's Amsterdam, 10th May 2000, lot 269.
For wine ewers and warmers of similar form but decorated in underglaze blue with iron-red bats, see two attributed to the 18th/19th century and with Yanghe tang zhi marks, sold at Christie's New York, 18th September 2003, lot 321, and Christie's London, 11th November 2015, lot 623.