A green-glazed 'olive-stone'-shaped vase. Qianlong four-character mark and probably of the period. Photo Bonhams

With fluted sides modelled after an olive-stone form, the exterior covered with a sea-green bubble-suffused glaze stopping short of the foot ring. 17.7cm (7in) high. 

Provenance: The Langsdorf Collection of Qing Dynasty Porcelain, Collection no.186.

Bonhams. Chinese & other Asian Works of Art, 29 Feb 2012, London, Knightsbridge www.bonhams.com