© London News Pictures. 04/11/2011. London, UK. A carved 17th century rhinoceros horn 'hundred boys' stem cup, which has been unseen by the public for at least £80 years,  estimated to fetch between £300,000 and £500,000 at a Christie's auction of Fine Chinese Ceramics and Works of Art on November 8th 2011. The auction, which is led by seven private collections, is expected to realise in excess of £15 million. Photo Credit : Ben Cawthra/LNP