Jade seal with 'chilong', Western Han dynasty

A square-shaped jade seal with a figure of a 'chilong' dragon carved on the top. On the base is an engraved seal "张高" (Zhāng gāo). In good condition, with reddish patina "沁色" (qìn sè) produced by antiquity. 

Size: 1.8 x 2.2 x 2.2 cm; Weight: 13.8 g