Few U.S. nameplates have sold more than 600,000 copies in a single model year. And one of those would be the 1966 Ford Mustang. Everyone at the company must have been working overtime to produce 607,568 of them along with Falcons, Fairlanes, Galaxies, and more. The seller’s convertible has been laid up for the past 20 years but looks fine except for the paint (which was a color change). It’s a California “black plate” registration from Simi Valley and the Ford is available here on eBay for $21,000 OBO.

Introduced at the New York World’s Fair in April 1964, the Mustang proved to be an instant hit. A small, sporty car that has seen a variety of iterations over the years and is still in production more than 60 years later. Ford built more than 72,000 Mustang convertibles in 1966 of which three-quarters were the “standard” model like this one. The seller calls it a “semi” barn find because it’s been in storage for two decades, but not necessarily in a barn.

To help it get back into the daylight, new parts have been added including the radiator, fuel pump, and battery. It still needs a fluids change, tune-up, and tires, but will run and drive the way it is (for short hops). For some odd reason, a previous owner dumped the original, gorgeous Tahoe Turquoise paint in favor of a rather uninspiring coat of grey which has seen better days (I’d go back to the turquoise).

The black interior in this Mustang looks original and quite nice and the car has a power top which we’re told works as it should. If you were to purchase this Ford, you’d become only its fourth owner in 58 years. This is one of the nicer first-generation Mustangs that we’ve seen unmolested, and we assume the 289 V8 and automatic transmission are original.