A Cizhou-type black glazed jar and a cover with russet-splashed decoration

A Cizhou-type black glazed jar and a cover with russet-splashed decoration
Northern Song/Jin dynasty
The jar potted with an upright neck and body of U-shape tapering sharply inward toward the foot ring and recessed base, the black glaze on the exterior splashed with large russet patches of 'partridge feather' type, but the interior walls showing a suffused russet and black glaze layer; the domed cover possibly associated but similarly glazed and of similar date.
5 1/8in (13cm) height of jar and cover (2).