1908 Mercedes 150 HP Semmering Rennwagen
Offered by RM Sotheby’s | Coral Gables, Florida | February, 2025
The famous Brooklands circuit in England held some… Formula Libre-style races back in its heyday. This meant that the cars were not required to meet Grand Prix regulations. So Paul Daimler built a monster 15.4-liter inline-four. The entered one of these cars at the Semmering hill climb in Austria, winning it with driver Otto Salzer
The next year they updated the two “Semmering” cars built with that engine to a displacement of 17.3 liters. Output was rated at 150 horsepower, a monster sum for the time. Salzer won at Semmering again in 1909, setting a time that wouldn’t be bested again until 1934.
The car later made its way to Australia before heading to California in the 1950s. It was sold to the pre-Indianapolis Motor Speedway Museum for $30,000 in 1964. It’s now offered from the museum with an estimate of $7,000,000-$9,000,000. RM says the car is a one-off, Mercedes own website says two were built. Click here for more info.