Bonhams, New Bond Street, London, UK. 12 November, 2018. Mask, an extremely rare sculpture by Henry Moore, is being offered at Bonhams Modern British and Irish Art sale for the first time in more than 80 years, and has never before been put up for auction. Image: Patrick Hughes, Hughes Henge, 1998, estimate £12,000-18,000. Credit: Malcolm Park/Alamy Live News.