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A 1933 Double Eagle gold coin sold for a record-setting $18.9 million at auction in New York on Tuesday, and the world's rarest stamp went for $8.3 million, Reuters reported.

The coin, the only 1933 Double Eagle ever allowed to be privately owned, was expected to sell for between $10 million and $15 million at the Sotheby's auction.

It was sold by shoe designer and collector Stuart Weitzman, who acquired it in 2002 for what was then a world record price of $7.6 million.

The coin, with a face value of $20 and distinctive design of an American eagle in flight one side and Liberty striding forward on the other, was the last gold coin struck for circulation in the United States.

But it was never issued after President Franklin Roosevelt took the United States off the gold standard and all copies were ordered destroyed.

Weitzman on Tuesday also sold a British Guiana One-Cent Magenta stamp, issued in 1856, for $8.3 million, confirming its place as the most valuable stamp in history.

The stamp is the only surviving one from a series that was printed by the South American nation because of a shortage of stamps sent over by its then British colonial rulers.

The designer had bought it in 2014 for $9.5 million and continued a tradition started by previous owners by adding his own flourish - a line drawing of a stiletto shoe and his initials - to the back of the stamp.

The buyers of the two items wished to remain anonymous, Sotheby's said.