A rare 'Jizhou' 'tiger skin' tea bowl Song Dynasty

the shallow rounded sides rising from a short foot to a straight rim, covered overall with a dark chocolate brown glaze with variegated buff streaks to the interior, the glaze falling short of the foot on the exterior to reveal the light buff body 

For a similarly glazed Jizhou bowl, see one illustrated in Porcelain of the Song Dynasty (II), The Complete Collection of Treasures of the Palace Museum, Hong Kong, 1996, pp.260-261.