The sale shattered pre-sale estimates of up to Aus$1.5 million, with the auction hammer coming down at Aus$2.45 million -- more than twice the average cost of a Sydney home.
"Just nine of these New South Wales number plates were ever issued, making them ultra-collectible and irreplaceable," said Shannons auction manager Christophe Boribon.
"Their unique status and desirability is never going to change.
"The opportunity to acquire such a plate is exceptionally rare, as most single-digit plates remain in family hands, are usually passed down through generations and rarely, if ever, come onto the open market."
It said he arrived at the Sydney auction on Monday evening in his red Ferrari bearing a No.2 licence plate.
He also reportedly owns a Hong Kong-registered No.1 plate and a personalised number plate "ONE" registered to his 1969 Mercedes in Sydney.
Boribon said the previous Australian auction record was for the NSW plate "2", which sold for Aus$689,000 in 2003.
According to records, the "4" plate first adorned a 1909 Rolls-Royce Silver Ghost, then owned by Michelin tyres importer Noris Duval, in New South Wales in the early 1920s.
The number "4" was one of seven black-and-white heritage NSW plates at the auction, with "321" selling for Aus$192,000 while "1968" made Aus$94,000.
According to the Herald, the New South Wales "1" plate is owned by the family of the late founding chairman of Australian National Airways, Sir Frederick Stewart, which has been in the family since the 1930s.
The number four is considered unlucky in Chinese culture because it almost sounds similar to the word for "death".
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