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Jean-Michel Basquiat, Four Big, 1982. Est. £7.5 million–£9.5 million ($9.3 million–$11.8 million). Courtesy Christie’s.
Sigmar Polke, Alpenveilchen/Flowers, 1967. Est. £5 million–£7 million ($6.2 million–$8.7 million). Courtesy Christie’s.