Every big car sale starts with a number printed in the catalog. The auction estimate is the house’s best guess at what a car will bring, and most of the time the hammer falls somewhere near it. Sometimes, though, bidders blow straight through that guess and keep going.
Those are the sales collectors talk about for years, because they rewrite price guides. A rediscovered Ferrari, a garage-find Bugatti or a white Porsche with almost no miles can turn a calm saleroom into a bidding war. When that happens, the final price says more about desire than any appraisal could.
These are our picks for seven European sports cars whose results ran far past what the experts predicted. We measured each one against something on the record: the published estimate, or the earlier world record it beat. The prices, estimates and histories come from the auction houses and from trade press that covered each sale.
1. 1955 Mercedes-Benz 300 SLR Uhlenhaut Coupé
Mercedes-Benz’s racing department built two of these coupes in 1955. They took their name from Rudolf Uhlenhaut, the engineer behind them, and they drew on the W 196 R Grand Prix car with its engine enlarged to 3.0 liters. That Grand Prix car had won two World Championships with Juan Manuel Fangio. RM Sotheby’s describes the car as capable of 180 mph, which made it one of the fastest road-legal cars of its day.
For 67 years, Mercedes kept both cars. Then, on May 5, 2022, it sold one in a private auction at the Mercedes-Benz Museum in Stuttgart. The price was €135,000,000. According to the RM Sotheby’s announcement, that beat the previous auction record by more than €90 million. The earlier record holder was a 1962 Ferrari 250 GTO.
No auction estimate ever appeared, and RM noted that few people imagined the car would be offered at all. The proceeds fund a Mercedes-Benz scholarship program, while the second coupe stays in the museum. If you like this chapter of Mercedes history, our story on Moss’s No. 722 300 SLR at the 1955 Mille Miglia covers its open-top sibling. In our view, no sale has ever surprised the market more.
2. 1967 Ferrari 275 GTB/4*S NART Spider, far past its auction estimate
Ferrari built just 10 of these open 275 NART Spiders. This one also had an unusual history. Eddie Smith Sr. of North Carolina bought it new from Chinetti in 1968, and his family kept it after his death in 2007. After that, the car went into storage and was rarely shown. Chinetti was one of Ferrari’s original importers, so the car also had a direct link to the brand’s early U.S. history.
RM Auctions offered the car during the Pebble Beach weekend in August 2013. The pre-sale auction estimate was $14 million to $17 million. Instead, bidding climbed to $27.5 million, a world record for a vintage Ferrari at auction at the time. Motor Authority’s report on the sale also noted that all proceeds went to charity.
That result landed more than $10 million above the top of the estimate. So this is the purest example on our list of a car beating expert predictions by a mile. One-family ownership, a tiny production run and a good cause all helped. Our take: the NART Spider is the clearest case on this list of a saleroom ignoring the experts.
3. 1961 Ferrari 250 GT SWB California Spider
This Ferrari spent decades hidden away in western France. It belonged to the Roger Baillon collection, a group of about five dozen cars that Artcurial revealed months before its February 2015 Retromobile sale in Paris. Hagerty described the Ferrari as remarkably well preserved and buried under a pile of magazines. It also has the desirable covered headlights.
Artcurial set an estimate of €9.5 million to €12 million. The hammer fell at €14.2 million, or €16.3 million with charges. So the hammer price alone landed €2.2 million above the top estimate. That made it the biggest result of any Retromobile sale that week, according to Hagerty’s recap of the Artcurial auction.
Meanwhile, the whole collection ran hot. A listing of results from Classic Car Auctions notes that all 59 Baillon cars sold, many at double their estimates. Some lots reached 10 to 20 times their estimates, and the 59 cars grossed €25.15 million. In our view, the California Spider proves how much buyers will pay for a true barn find. Untouched history, it turns out, is worth more than a fresh restoration.
4. 1956 Maserati A6G 2000 Gran Sport Berlinetta by Frua
The same Baillon barns held a second Italian sports car that caught bidders by surprise. It was a 1956 Maserati A6G 2000 Gran Sport Berlinetta with coachwork by Frua. However, it wasn’t the headline lot.
Artcurial’s estimate for the Maserati was €800,000 to €1.2 million. Then the room took over. It sold for €2,000,000, almost double its estimate, according to the published results. That’s two and a half times the low end of the range. Hagerty listed the result at about $2.28 million.
Other Baillon cars did the same thing. A 1949 Talbot-Lago T26 Grand Sport with Saoutchik bodywork carried a €400,000 to €600,000 estimate and brought €1.7 million. A 1948 Talbot-Lago Record T26 Cabriolet, also by Saoutchik, sold for €745,000. Still, the Maserati is the one we’d point to, because it’s a genuine Italian sports car with a coachbuilt body. Our take: when a barn-find Maserati nearly doubles its auction estimate, it shows that originality had become the most valuable feature a classic could have. If you love postwar Maseratis, this result is a useful benchmark for what an untouched coachbuilt car can do.
5. 1968 Bizzarrini 5300 GT Strada
The 5300 GT Strada was Giotto Bizzarrini’s road car. It paired an Italian body with American V8 power. In our view, it’s one of the most striking Italian shapes of the 1960s.
At Artcurial’s February 2015 Paris sale, a 1968 example became one of the stars of the day. According to Hagerty’s auction recap, it sold for €1,200,000, or about $1,368,330. That was nearly double Artcurial’s pre-sale estimate. Hagerty put the total for the whole sale at €46,544,273, and the Bizzarrini was one of several cars that left its estimate far behind. If you ever wondered whether a 5300 GT Strada was worth serious money, the room in Paris answered loudly.
The Bizzarrini had no barn-find story to push it. It sold on its own merits, at the same sale where the Baillon cars dominated the headlines. Our profile of why Giotto Bizzarrini helped create several automotive legends covers the engineer behind it. In our view, this result is the moment the market decided Bizzarrinis belonged in the same conversation as the Ferraris and Maseratis of their era.
6. 2015 Porsche 918 ‘Weissach’ Spyder
Not every surprise is an old car. In December 2023, RM Sotheby’s sold The White Collection, a group of Porsches offered in Houston. Even so, the star was a 2015 Porsche 918 Spyder with the Weissach performance package.
The RM Sotheby’s lot description shows a paint-to-sample Grand Prix White finish and just 12 miles at the time of cataloguing. RM also called it the only 918 built with that specification. It sold for $3,937,500, according to the RM Sotheby’s lot page.
Old Cars Weekly reported that the 918 sold for nearly $1 million over its high estimate. Coverage of the sale also says it beat the earlier auction record for the model by nearly $2 million. The whole collection brought $30,505,620, with bidders from more than 35 countries. Other lots ran hot too. A 1997 Porsche 911 GT2 sold for $2,397,500, and a 2016 911 R set a record at $1,105,000. Old Cars Weekly said several top lots sold well over their pre-auction estimates. Our take: a modern hypercar rarely beats its auction estimate by this much, because buyers can usually find another. This one proved that a one-off spec and near-zero miles can make a new car feel as rare as a classic.
7. 1937 Bugatti Type 57S Atalante
Bugatti completed chassis 57502 in May 1937. Its first owner, in fact, was the fifth Earl Howe, the first president of the British Racing Drivers’ Club. He kept it for eight years and drove it to Brooklands and other race meetings. Howe also fitted his own bumpers, mirrors and a luggage rack.
After the war, later owners included Lord Ridley. Then, in 1955, an orthopedic surgeon named Dr. Harold Carr bought it. He drove it for a few years and parked it in his garage in the early 1960s. The car stayed there for nearly 50 years, until Carr’s death in 2007, as Sports Car Market reported before the sale. His family then sold it with a file of letters documenting its history.
Bonhams estimated the car would bring in excess of $3.8 million at its Retromobile sale in Paris in February 2009. Instead, it sold for about €3.4 million, or roughly $4.4 million, according to Old Cars Weekly. In our view, the Bugatti showed that a great barn find can beat its auction estimate in any market. The final price landed about $600,000 above the figure Bonhams had put forward.
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