A Cizhou conical oil-spot teabowl, Jin Dynasty, 1115-1234, covered with a thick black-brown glaze with irregular russet spots, 12 cm diameter, fitted box. Provenance: R & V Tregaskis, late 1990's. See Mowry 'Hare's Fur, Tortoiseshell and Partridge Feathers..', Harvard 1996, cat no 37, pp140-142; also Regina Krahl 'Chinese Ceramics from the Meiyintang Collection', vol 3, cat no 1503, p498 for a very similar bowl with silver oil spots