An ultra-rare Mercedes-Benz race car sold for $143 million earlier this month, making it the most expensive car ever sold.

RM Sotheby’s announced it auctioned off a 1955 Mercedes-Benz 300 SLR Uhlenhaut Coupe for 135 million euros, or about $143 million. The sale smashed the previous record for the most expensive car sold at auction by more than $95 million and topped the $70 million record for a car sold privately.

The winning bid was made by British car collector, advisor and dealer Simon Kidston on behalf of an unnamed client. Kidston lobbied the Mercedes-Benz board for 18 months to consider selling the car.

The sale, first reported by Hagerty Insider, took place May 5 in a secretive and highly unusual auction at the Mercedes-Benz Museum in Stuttgart, Germany. Only selected collectors and Mercedes-Benz customers were invited to attend.

The 300 SLR Uhlenhaut Coupe is one of only two created in 1955 and is regarded as one of the most prized cars in auto history. It was built by Mercedes’ race department and named after its chief engineer and designer, Rudolf Uhlenhaut.

The Mercedes-Benz company owned both of the 300 SLR cars, and the May 5 sale took many collectors by surprise.

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