A Chinese yuteki tenmoku 'oil spot' tea bowl, Jian kilns, Fujian province, Song dynasty, the deep sides covered inside and out with a thick, black iridescent glaze suffused with irregular 'oil spots', stopping above the foot exposing the brown-black body, the mouth mounted with a Japanese lightly scored metal band, 12.7cm diameter, 7cm highProvenance: 19th century Japanese collection, Noriyo family