Offered at Sotheby’s Hong Kong in October, this Song dynasty brush washer has an estimate in excess of HK$100m.

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The 5in (13cm) diameter dish was part of the Le Cong Tang collection and was formerly in the Chang Foundation in the Hongxi Museum, Taipei.

In the last decade prices for Song objects have lagged behind Qing imperial porcelain, but the appearance of some spectacular examples in recent times are helping to redress the balance.