A bronze ritual wine vessel (zun), Early Western Zhou Dynasty, 11th-10th century BC. Photo: Sothebys.

rising from a splayed foot to an everted rim, the central section cast in relief with two taotie masks with bulging eyes on a leiwen ground divided by narrow flanges between double bowstring bands, the dark brownish-green patina with some light malachite encrustation, Japanese wood box and cover (3). Height 10 in., 25.4 cm. Estimation 40,000 — 60,000 USD 

An old Japanese collection before the 1950s and thence by descent. 

Sotheby's. Fine Chinese Ceramics & Works of Art. New York | 17 sept. 2013 - http://www.sothebys.com