LONDON.- Several works by the renowned graffiti artist Banksy are to be sold at Bonhams, New Bond Street, as part of its Urban Art sale on 21 September 2011. Leading the way is a work featuring one of Banksys most iconic images, the monkey, entitled Monkey Detonator, which has attracted a pre-sale estimate of £70,000 90,000. Executed in 2000, this canvas displays the typically dark sense of humour which has endeared Banksy to both art collectors and the general public. Other original Banksys featured in the sale include HMV Dog (estimate £10,000 15,000); Precision Bombing (£15,000 25,000); Watchtower Collaboration Blu (estimate £10,000 15,000); and Balloon Girl (estimate £20,000 30,000). Chinese Soldier by American contemporary artist and graphic designer, Shepard Fairey, one of only seven hand painted works produced by the artist, is another sale highlight, attracting a pre-s