British Prime Minister Winston Churchill's last ever painting, The Goldfish Pool at Chartwell, at a Sotheby's auction.

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British Prime Minister Winston Churchill's last ever painting, The Goldfish Pool at Chartwell, at a Sotheby's auction.

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British Prime Minister Winston Churchill's last ever painting, The Goldfish Pool at Chartwell, at a Sotheby's auction.

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British Prime Minister Winston Churchill's last ever painting, The Goldfish Pool at Chartwell, at a Sotheby's auction.

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The last picture painted by British Prime Minister Sir Winston Churchill, depicting the goldfish at Chartwell, left, is put up for sale at Sotheby's. Right: painting by Winston Churchill "Landscape with Two Trees."

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The last picture painted by British Prime Minister Sir Winston Churchill, depicting the goldfish at Chartwell, left, is put up for sale at Sotheby's. Right: painting by Winston Churchill "Landscape with two trees."

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The last picture painted by British Prime Minister Sir Winston Churchill, depicting the goldfish at Chartwell, is put up for sale at Sotheby's.

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The last picture painted by British Prime Minister Sir Winston Churchill, depicting the goldfish at Chartwell, is put up for sale at Sotheby's.

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The last picture painted by British Prime Minister Sir Winston Churchill, depicting the goldfish at Chartwell, is put up for sale at Sotheby's.

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The last picture painted by British Prime Minister Sir Winston Churchill, depicting the goldfish at Chartwell, is put up for sale at Sotheby's.

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The last picture painted by British Prime Minister Sir Winston Churchill, depicting the goldfish at Chartwell, is put up for sale at Sotheby's.

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The last picture painted by British Prime Minister Sir Winston Churchill, depicting the goldfish at Chartwell, is put up for sale at Sotheby's.

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