Sotheby's

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Sotheby's director of the department of printed books and manuscripts Dr Philip Errington poses for photographers with a first edition copy of the first Harry Potter book "Harry Potter and the Philosopher's Stone" containing annotations and illustrations by author J.K. Rowling, during a photocall organized for the media at the auction house's premises in London, Monday, May 20, 2013. The book will be offered for sale as part of the "First Editions, Second Thoughts" auction on May 21, for which there are no price estimates available in advance as it is a charity sale. (AP Photo/Matt Dunham)

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The Apollo 11 Contingency Lunar Sample Return Bag used by astronaut Neil Armstrong, to be offered at auction, is displayed at Sotheby's, in New York, Thursday, July 13, 2017. The lunar dust plus some tiny rocks that Armstrong also collected are zipped up in a small bag and are worth an estimated $2 million to $4 million. (AP Photo/Richard Drew)

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The Apollo 11 Contingency Lunar Sample Return Bag used by astronaut Neil Armstrong, to be offered at auction, is displayed at Sotheby's, in New York, Thursday, July 13, 2017. The lunar dust plus some tiny rocks that Armstrong also collected are zipped up in a small bag and are worth an estimated $2 million to $4 million.(AP Photo/Richard Drew)

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A full scale Custom Sputnik-1 model, above, to be offered at auction at Sotheby's, is displayed in New York, Thursday, July 13, 2017. It is estimated at $8,000 to $12,000. (AP Photo/Richard Drew)

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The Apollo 13 Flown Flight Plan, with extensive annotations by the crew, to be offered at auction at Sotheby's, is displayed in New York, Thursday, July 13, 2017. It is estimated at $30,000 to $40,000. (AP Photo/Richard Drew)

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A Custom Command/Service Module, and Planetary Globe, right, to be offered at auction at Sotheby's, are displayed in New York, Thursday, July 13, 2017. The Custom Command/Service Module is estimated at $5,000 to $7,000. (AP Photo/Richard Drew)

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A Gemini G1C Spacesuit Thermal Coverlayer, left, and a Wind Tunnel Test Model, to be offered at auction at Sotheby's, are shown in New York, Thursday, July 13, 2017. The spacesuit is estimated at $40,000 to $60,000 while the test module is estimated at $8,000 to $12,000. (AP Photo/Richard Drew)

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A flown Apollo 11 Flight Plan Sheet signed by Buzz Aldrin, to be offered at auction at Sotheby's, is displayed in New York, Thursday, July 13, 2017. The sheet is estimated at $25,000 to $35,000. (AP Photo/Richard Drew)

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A print of astronaut Neil Armstrong's photograph of fellow Apollo 11 astronaut "Buzz" Aldrin standing on the moon, to be offered at auction at Sotheby's, is displayed in New York, Thursday, July 13, 2017. The photo, autographed by Aldrin, is estimated at $2,500 to $3,500. (AP Photo/Richard Drew)

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The Apollo 11 Contingency Lunar Sample Return Bag used by astronaut Neil Armstrong, to be offered at auction, is displayed at Sotheby's, in New York, Thursday, July 13, 2017. The lunar dust plus some tiny rocks that Armstrong also collected are zipped up in a small bag and are worth an estimated $2 million to $4 million.(AP Photo/Richard Drew)

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Members of staff at Sotheby's auction house move easels and plinths near to an oil painting entitled ' Ehrenbreitstein' (1835), by British artist J.M.W.Turner, in London, Friday, June 30, 2017. The painting is expected to be sold for some 15-25 million pounds, (US$18.7-31.2 million, euro 17.3-28.9 million) when sold at auction on July 5. (AP Photo/Alastair Grant)

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Members of staff at Sotheby's auction house wait next to an oil painting entitled ' Ehrenbreitstein' (1835), by British artist J.M.W.Turner, in London, Friday, June 30, 2017. The painting is expected to be sold for some 15-25 million pounds, (US$18.7-31.2 million, euro 17.3-28.9 million) when sold at auction on July 5. (AP Photo/Alastair Grant)

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Members of staff at Sotheby's auction house move an oil painting entitled ' entitled 'Kilchurn Castle, with the Cruchan Ben Mountains, Scotland -Noon', by the artist J.M.W.Turner, in London, Friday, June 30, 2017. The painting is expected to be sold for some 15-25 million pounds, (US$18.7-31.2 million, euro 17.3-28.9 million) when sold at auction on July 5. (AP Photo/Alastair Grant)

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Members of staff at Sotheby's auction house pose for the media in front of a display of works by British artist J.M.W.Turner, in London, Friday, June 30, 2017. The painting is expected to be sold for some 15-25 million pounds, (US$18.7-31.2 million, euro 17.3-28.9 million) when sold at auction on July 5. (AP Photo/Alastair Grant)

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Members of staff at Sotheby's auction house adjust an oil painting entitled ' Ehrenbreitstein' (1835), by British artist J.M.W.Turner, in London, Friday, June 30, 2017. The painting is expected to be sold for some 15-25 million pounds, (US$18.7-31.2 million, euro 17.3-28.9 million) when sold at auction on July 5. (AP Photo/Alastair Grant)

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In this photo provided by Sotheby's, an oil on canvas entitled The Bird Charmer (Encantador De P·jaros) by Rufino Tamayo is shown. The painting will be part of Sotheby's Latin America: Modern Art Evening Sale in New York on Thursday, May 25, 2017. (Sotheby's via AP)

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ADDS COURTESY OF YUSAKU MAEZAWA TO THE SOURCE - This undated photo provided by Yusaku Maezawa via Sotheby's shows Yusaku Maezawa, who bought Jean-Michel Basquiat's Masterpiece "Untitled," Thursday, May 18, 2017. Sotheby's said the sale of the artwork Thursday night in Manhattan was an auction record for the artist. It also set a record price for an American artist at auction. The piece was purchased by noted Japanese collector and entrepreneur Maezawa after a 10-minute bidding war. (Courtesy of Maezawa via Sotheby's via AP)

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This undated photo provided by Sotheby's shows Yusaku Maezawa, who bought Jean-Michel Basquiat's Masterpiece "Untitled," Thursday, May 18, 2017. Sotheby's said the sale of the artwork Thursday night in Manhattan was an auction record for the artist. It also set a record price for an American artist at auction. The piece was purchased by noted Japanese collector and entrepreneur Maezawa after a 10-minute bidding war. (Sotheby's via AP)

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FILE - In this Thursday, May 11, 2017 file photo, a Sotheby's employee displays the Apollo blue diamond and the Artemis pink diamond earrings during a preview at the Sotheby's, in Geneva, Switzerland. Sotheby's sold a pair of pear-shaped diamond earrings at a hammer price of about $51 million Tuesday, May 16, 2017, though the 14.54-carat flawless Fancy Vivid Blue diamond that was the auction's highlight fell short of the expected range. (Martial Trezzini/Keystone via AP, File)

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In this Wednesday, March 29, 2017, file photo, the "Pink Star" diamond, the most valuable cut diamond ever offered at auction, is displayed by a model at a Sotheby's auction room in Hong Kong. The stunning 59.6 carat diamond has sold for HK $553 million or US $71.2 million at a Sotheby's auction in Hong Kong, setting a record for any diamond or jewel. It's Also the highest price for any work ever sold at auction in Asia. (AP Photo/Vincent Yu, File)