One-cent magenta stamp auction has broken the record of all auctions in NYC. Once belonging to the Du Pont Murderer, the rare one-cent magenta stamp auction has set the record and sold the world-famous stamp for $9.5 million.

The one-cent magenta stamp auction happened on Tuesday in New York and had sold a one-cent magenta 1856 British Guiana. According to CBS News, the one-cent magenta stamp auction was the fourth time the same stamp broke an auction record of a single stamp in its long history.

The stamp had reportedly been expected to bring between $10 million and $20 million in the one-cent magenta stamp auction. According to David Redden, Sotheby's vice chairman, the buyer requested to remain anonymous. The stamp's final price reportedly included the buyer's premium.

Redden called the one-cent magenta stamp auction sale "a truly great moment for the world of stamp collecting." He added, "That price will be hard to beat, and likely won't be exceeded unless the British Guiana comes up for sale again in the future."

The one-cent magenta stamp auction has sold a 1-cent postage stamp from the 19th century. Belonging to a British colony in South America, the stamp has once again reportedly become the world's most valuable stamp.

According to The Associated Press, the stamp from the one-cent magenta stamp auction last belonged to John E. du Pont, the heir of the du Pont chemical fortune. He was reportedly been convicted of shooting a 1984 Olympic champion wrestler who died because of the attack. Sold by his estate, proceeds from the stamp's sale will be allocated to the Eurasian Pacific Wildlife Conservation Foundation where du Pont had been held a champion.

The stamp from the one-cent magenta stamp auction was printed in black on magenta paper and had the image of a three-masted ship and the colony's motto, in Latin: "we give and expect in return," reports The Guardian. The stamp had reportedly begun circulating when a shipment of stamps was delayed from London. This caused the postmaster to ask the Royal Gazette newspaper in Georgetown in British Guiana for printers in order to fabricate three stamps until the shipment arrives. The three stamps were a 1-cent magenta, (which was included in the one-cent magenta stamp auction), a 4-cent magenta and a 4-cent blue.

The one-cent magenta stamp reportedly measured 1 inch-by-1¼ inches and has not been available to the public's eye since 1986. The item from the one-cent magenta stamp auction is, reports say, the remaining major stamp missing from the British Royal Family's private Royal Philatelic Collection.

According to Director Allen Kane of the Smithsonian National Postal Museum, "You're not going to find anything rarer than this. It's a stamp the world of collectors has been dying to see for a long time."

It is amazing that the minute 1-cent stamp is the only one known in existence.

One-cent magenta stamp auction is a great feat in this age for the organizers of the auction since the stamp has also set its third record in 1980 when it sold for $935,000 to du Pont. According to retiree David Beech, longtime curator of stamps at the British Library, being able to buy the stamp can be compared to buying the "Mona Lisa" of the world's most prized stamps.