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Mustang Serial Number 1 accidentally sold in 1964, but was possibly saved because of that. USA TODAY

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After a 17-year absence, a new Mustang Mach 1 is ready for launch. With new aerodynamics and suspension upgrades, the 480-horsepower 2021 Mach 1 will be "the pinnacle of 5.0L Mustang performance and handling" when it goes on sale next spring, Ford said.

The Mach 1 is a storied model in Mustang history. Launched in 1969, it won back-to-back Sports Car Club of America Manufacturer’s rally championships and set 295 speed and endurance records at the Bonneville Salt Flats in its first model year. Since that first generation, Ford has built just two Mach 1s: One on the underappreciated Mustang II that kept the pony car alive through oil shocks in the 1970s, and an ’04 model on the fourth-generation Mustang.

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