A collection of Chinese jade bi-discs

Zhou dynasty (circa 1100-256 BC) and later
Comprising a disc carved with raised bosses; two discs carved with geometrical bands; a plain mottled brown and russet jade disc; a three-part disc carved with scrolls; and a brown jade disc fragment carved with a taotie mask.
Diam. 14 cm (the largest)
Provenance:
- Private collection, the Netherlands (assembled from 1950 till the 1990's)
- By descent to the present owner
(6x)