An extraordinarily rare 1971 Chevrolet Corvette ZR2 Convertible is expected to sell for between $1 million and $1.2 million when it crosses the auction block at a Mecum sales event from May 13-21.

Chevrolet introduced the Corvette ZR2 as the ultimate version catering towards those looking to go racing in their ‘Vettes. It came outfitted with a number of bespoke components, most notably the RPO ZR2 Special Purpose LS6 Engine Package that mated a 454 cubic-in LS6 naturally aspirated V8 engine with a Muncie M22 close-ratio ‘Rock Crusher’ four-speed manual transmission.

In addition, the car was built with a transistorized AC/Delco ignition system and heavy-duty front and rear suspension components, including new springs, shocks, and sway bars both front and rear. It also includes a high-capacity aluminum radiator with a shroud delete and heavy-duty disc brakes.

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Chevrolet sold the 1971 Corvette ZR2 for $7,672 or roughly the equivalent of $54,400 in today’s money. That high asking price meant that just 12 units were ever purchased, of which only two are convertibles.

This particular Corvette ZR2 Convertible is the lowest-milage ZR2 known to exist and has only ever been driven 8,702 miles (14,004 km). It is finished in the original Brands Hatch Green paint and comes complete with a black soft top and a color-matching hardtop. It has won numerous awards over the years, including the MCACN Triple Diamond Award, the NCRS Top Flight Award, and the MCACN Concours Gold.

Mecum Auctions reveals that the car is unrestored and remains in excellent condition. It is being sold with complete documentation, including the original vehicle purchase order, shipping invoice, and the original tank sticker. According to the car’s owner, Ed Foss, this is the most original ZR2 in the world and is the only one that hasn’t been restored.