A rare pair of Chinese white jade bangles 18th/19th century

A rare pair of Chinese white jade bangles 18th/19th century, each finely carved with dragon heads contesting a pearl, the stone an even white, 6.8cm. (2) Cf. Christie's New York, 24th March 2011, lot 1544 for a similar pair, and also Littleton and Hennessy, Jade Handling Pieces, no.28.