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Only four Hesketh 308 chassis were built, of which the car being offered for sale is both the first and most significant.

Its debut appearance was at the 1974 Brands Hatch Race of Champions, where Hunt staggered the paddock by placing the car on pole position before spinning off on lap four.

Hunt later took the car to pole at Silverstone’s International Trophy where, after a slow start, he overtook Ronnie Peterson’s Lotus down the inside and into the Woodcote corner to land Hesketh’s first and only Formula One victory.

The car will be sold during the weekend of the Grand Prix de Monaco Historique from May 9-11 and is expected to fetch around £500,000.