RM Sotheby’s is going to auction the exceptional 1963 Aston Martin DP215 Grand Touring Competition Prototype at next month’s Monterey sale, and the one-of-a-kind example could become the most valuable car from a British manufacturer.

The Aston Martin DP215 was the epitome of Aston Martin Racing in history. Built under owner David Brown’s supervision in March 1963, this exclusive project was developed specifically for the 24 Hours of Le Mans. Driven by Phil Hill, the Formula 1 and triple Le Mans winner and Belgian Lucien Bianchi, this Aston Martin DB215 became the first car to reach the 300 km/h barrier, reaching 198.6 mph on the Mulsanne Straight when Phil Hill was on the wheels during qualifying.

Following its racing career, the Aston Martin DP215 changed hands several times and has gone through extensive restoration. Now the DP215 is reunited with its original engine and fitted with a correct-type five-speed gearbox. Estimated at US$20-25 million, the DP215 will be presented at the Monterey auction on 24-25 August.