NORTHERN SONG DYNASTY, LATE 11TH-EARLY 12TH CENTURY The bowl is exquisitely potted with rounded sides supported on a short foot, rising to a slightly tapering mouth. It is covered overall with a subtly crackled unctuous glaze of soft, attractive greyish-blue tone, thinning at the rims to reveal the ashen body underneath. The foot ring has three tiny, sesame-shaped spur marks. 4 in. (10.2 cm.) diam., Japanese wood boxes, one inscribed Seiji Chawan (celadon tea bowl)