This jar is made in the sgraffito technique. Which means that a glaze is applied and then cut away in a design, before the glaze firing. This jar is most likely from the Western Xia or Xixia dynasty between 1038 and 1227 in the northwest of China. But similar type was made in the Cizhou kilns in nearby Hebei province.
The bold design, glaze,and shape of foot points towards a Xixia piece. This jar is 12 cm high, and is restored from two or three large shards, but is complete. Just some chips to the rim, but did not lose any of it’s charm.