An early-1950s Jaguar C-Type racecar will be a top lot at the Bonhams Monaco Sale (bonhams.com) on May 13 in Monte Carlo. The auction will feature about 40 cars, none with a more puzzling history than the Jaguar. It was once thought to be chassis number XKC 011 with the body from XKC 047, but Bonhams recently concluded it is chassis XKC 047 with its original body. It’s the car that raced in the 24 Hours of Le Mans in 1953 and finished ninth overall. Opinions about the Jaguar’s identity have changed over the years, but the car’s condition hasn’t: It’s virtually the same as it was 53 years ago, when it was acquired by the family who is selling it.