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TOPSHOT - Gallery assistants study "Mask", a sculpture by Henry Moore, at Bonhams auction house in London on November 12, 2018, ahead of the Bonhams Modern British and Irish Art sale on Wednesday 14 November. - The work is one of 12 known small carvings by Moore, and uniquely is the only one carved from alabaster. The artwork has an estimated value of Ј1,000,000-Ј1,500,000 GBP (1,143,000-1,688,000 Euros, $1,287,000-$1,930,000 USD). (Photo by ADRIAN DENNIS / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION