A rare oil sketch by Rembrandt, Study of a Head of a Young Man (c.1650), sold for £9,480,800 at Sotheby’s Old Masters Evening Sale on 5 December. Appearing on the market for the first time in 60 years, the 17th-century masterpiece left its estimate of £6-8 million far behind at Sotheby’s London auction house. A touching portrait of Christ, the painting until recently hung in the Dutch master’s house in Amsterdam. Interest in the work...