A SPINACH JADE SQUARE WASHER Wanli four-character mark, 19th/early 20th century (2)A London private collection of jade carvings and Chinese works of art, lots 1-104A SPINACH JADE SQUARE WASHERWanli four-character mark, 19th/early 20th centuryEach face carved in low relief with a taotie mask design, the base incised with a seal mark, fitted hongmu stand.5.5cm (2 1/4in) high (2).Provenance: a London private collection amassed between the 1970s and 1990s and thence by descent.