The 3½x 4½in (9 x 11.5 cm) jar is of a decorative type known as tobi seiji, a Japanese term meaning flying celadon that refers to wares made around the Longquan kilns in China during the Yuan dyansty. The brown iron oxide spotting on the piece is a signature technique of Longquan kilns in the 13th and 14th centuries.
The jar has a provenance by descent from the collection of a German consular officer in China from 1902-17 and 1920-30.
It has an estimate of $10,000-20,000.