Audi also used the 100 to show global buyers that the brand had really kicked its old Auto Union identity (Auto Union had became a wholly owned subsidiary of Volkswagenwerk AG in 1966). Kraus, a star designer and engineer who directed many of Mercedes’s successful Formula 1 cars, drafted the look.

The coupe-size bodylines and delicate pavilion roof immediately stood out compared with the heavier steel and muscle cars Detroit was making at the time. Even though the four rings on the Audi logo represented the four brands of automobile produced at the time by Auto Union—Horch, Wanderer, Audi, and DKW (aka Der Kliene Wunder, The Small Wonder)—the change was enough to make an impact. Everything in Audi’s modern fleet can trace its design back to this car.

“The engineers in Germany were developing cars that were a little bit more forward thinking in terms of efficiency and understanding that you couldn’t go down the road in just anything as heavy as you want,” Dahncke said. “That’s why the Audi 100 got its introduction. And later it influenced everything to the Audi A4. It set the table for all things that came thereafter.”

Sturdy and Short
The first 100s were front-wheel drive sedans with 4-cylinder, 112-horsepower engines. They came with a four-speed manual or automatic transmission on a short, sturdy chassis. The police used them often because of their agility and on-road practicality (a two-tone police paint finish, flashing blue light, and siren were applied after the factory).

In later years, the coupe and saloon versions became popular and came with a long list of such standard design features as twin headlights and chrome wheel arches that helped boost its price. It didn’t hurt that in some light, from some angles, the Audi 100 Coupé S also looked similar to the Aston Martin DBS.

By the last years before its update in 1976, the Audi 100 came in seven different variant and trim levels, plus a coupe and sedan version in the U.S. Audi sold more than 6,500 of them during the first year, which was more than expected, and nearly 800,000 of them globally and 300,000 in the U.S. over the entire model run. Today, fewer than 1,000 roadworthy examples exist in the U.S., according to Hemmings.

Where Did All the Models Go?
It means you’re going to have a tough time finding one. And you’ll probably need a specialist to help connect you with sellers in Europe: Casual searches on EBay motors, Autotrader, and Carsforsale.com typically result in no viable options for sale. They do come to auction from time to time, but inquiries at Gooding & Co. and Sotheby’s didn’t return recent results. Look on Instagram, and you’ll see plenty of enthusiasts but little commerce.

They’re rare because they were practical: U.S. buyers bought them and drove them into the ground. And since they weren’t expensive at the time, it wasn’t worth restoring most of them.

“It’s the case of a cool car that was used up,” Klinger said. “It was a utilitarian vehicle—they were used and then repurposed and then discarded, so you’re left with a small sample of what was produced.”

If You Find It, Buy It
In other words: pounce. It probably won’t cost you much—as little as $4,000 online in the U.S., although prices can reach $62,000 overseas for one in mint condition. Recent sales in Europe saw later versions of the sedan, which originally sold for less than $4,000, fetch roughly $8,000. Top resale values for the 1970 LS two-door sedan in the U.S. hover around $7,000, according to KBB’s collector car senior market editor, Phil Skinner.