Way back in May of 1966, Ford Performance was working on a secret project: a mid-engine Mustang. The problem is, no one who worked on the car is around at Ford anymore. After a number of years of reaching out to current and former staff for information about the project, the Blue Oval is now asking the public for help. It's released these mysterious black and white photographs, too.

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The photos reveal a two-seat 1966 Mustang with a frunk, a working windshield, and sketches of the mystery Mustang hanging behind it in Ford's design studio. More photos from the same day (May 2, 1966) show the car's mid-mounted V-8 engine in place (with enough space behind it to fit—and cook—a full-size spare tire).

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Shots of the car from the rear reveal a pretty sweet looking Mustang (the pictures even tell us the time of day: 10:00 am). The photos were discovered by Dean Weber, head of Ford Archives, five years ago. Weber sent the shots to John Clor at Ford Performance and John Clinard, Ford's West Coast public relations guru.

Weber thought the vehicle in question might have been re-skinned as the Mach 2 Concept. Still, he was stumped. So was noted Mustang author Clor, who thought it might be part of Eugene Bordinat's previous Allegro project. Clor even reached out to Hal Sperlich and Gale Halderman who were working in the studio back then.

Sperlich assumed it was a drivable version of the Ford Research mid-ship Mustang, but Halderman said the mid-ship Mustang I concept was a one-off that was not based on a production vehicle. Roy Lunn, the "godfather" of the GT40, surely would have known what this mystery Mustang is since he worked on every mid-engine project at Ford. If he did, though, he sadly took it with him to his grave.

So now this mystery is up to you readers, experts, and Mustang maniacs. Take a good look at these old photos and if you know what the hell it is, then drop us a line. You can also feel free to reach out to ClubHub@Ford.com.

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Ford says it will give credit to the person who solves this mystery. The brand will send the person who identifies this mystery Mustang a special prize, as well. That said, if the individual who knows the story behind this mid-engine pony shares the deets about it with us first, then we'll send him or her a prize, too. (Hope you like t-shirts!) Good luck out there!