"One of Russell Crowe's personal cars, this vehicle also served as one of the wedding cars on the day of his marriage to Danielle Spencer on 7 April 2003", a note next to the Mercedes says.
Before the auction started, Sotheby's predicted the 227 eclectic lots, covering movies, guitars, paintings, jewelry, watches and sporting memorabilia, would bring between AU$2.6 million and AU$3.7 million.
He said it was put in as a joke, "It was my jock strap when I won the heavyweight championship of the world as the character James J. Braddock in the film Cinderella Man".
The torso armour Russell Crowe wore for his Oscar-winning role in Gladiator eclipsed expectations at a Sydney auction on Saturday, selling for 125,000 Australian dollars ($96,000).
"I haven't really thought about that, you know, but money's useful, money's fun", he said.
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Numerous items far exceeded the expectations of auction house Sotheby's Australia, including costumes and props from the 2000 movie Gladiator.
Following the auction, Crowe took to Twitter to express his satisfaction with the results, revealing he sold $3.7 million worth of his stuff, with ongoing discussions to sell another $350,000 worth, quipping, "not a bad hourly rate for a 5-hour shift".
Sotheby's Australia had estimated the stunt cuirass worn in the 2000 blockbuster would fetch between AU$20,000 and AU$30,000.
The actor, whose sell-off coincided with his 54th birthday, made a surprise appearance at the event on Saturday night to see some of his fondest possessions go under the hammer.
The highest price for film memorabilia was reserved for a century-old Leandro Bisiach violin used in the 2003 period war drama Master and Commander that sold for $135,000.
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The Briton had been off the pace in the day's two free practice sessions, ending up the fourth fastest in the evening. But he could only manage fourth, failing to improve his time on his final lap and leapfrogged by Bottas.
A number of sought-after artworks were also up for grabs, including a 1960 Charles Buckman work which sold for $360,000. The costume he wore for that same movie wasn't far behind, sold for $115,000. The official poster for the event shows a dapper Crowe with a cocktail in hand, smiling and tilting his glass.
Russell paid twice what Martin had been offered by an auction house and promised his cousin if he ever sold the gear for more than what he paid he would share the profit with Martin.
A 1986 Grammy Award that was jointly presented to Johnny Cash, Carl Perkins, Jerry Lee Lewis, Roy Orbison, Sam Phillips, Rick Nelson and Chips Moman sold for $150,000.
Asked why he was getting rid of the items, Russell said: 'Number one, I have a vast collection of things.
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