Ru yu two-character mark, 17th/18th centuryFinely carved to the exterior with two taotie masks below a key-fret band on either side of the flared rim, the handle formed by an adult and young sinuous chi dragons climbing over the rim, with a further chi dragon clambering up one side, raised on a ridged flared foot, the base relief-carved with a two-character Ru yu ('like jade') zhuanshu seal mark, the horn of a rich honey-brown tone. 14.9cm (5 7/8in) wide