Alfa Romeo Zagato TZ3 Stradale based on Dodge Viper for sale.

Italian coachbuilder and design house Zagato built just nine Alfa Romeo Zagato TZ3 Stradale cars at the beginning of last decade, and one of them is for sale.

The dark brown unit for sale at TSG Autohaus in Costa Mesa, California, has an asking price of $699,000. It has only 525 miles on the odometer and appears to be in pristine condition.

The car is the seventh of nine Zagato TZ3 Stradale cars built and was originally acquired by an Italian customer. It features a Chestnut Brown interior and carbon fiber on the exterior.

Like the other Zagato TZ3 Stradales, this coach-built supercar is based on the framework of the 2010 Dodge Viper ACR-X and is powered by an 8.4-liter V10 engine mated to a six-speed manual transmission, producing 640 hp and 585ps. Zagato's design will be noticed for its inheritance of the Viper's side-mounted exhaust tips.

It was in 2010 that Zagato celebrated Alfa Romeo's 100th anniversary by unveiling the Alfa Romeo TZ3 Corsa track car, a tribute to the original Giulia TZ sports car of the 1960s. The one-off car was commissioned by German collector Martin Kapp and is based on Alfa Romeo's 8C Competizione supercar.

The design proved so popular that Zagato decided to build an additional model based on the Viper. At the time, Zagato described the car as "the first American Alfa in automotive history," combining "unbridled American power" with "Italian grace. And the whole project was inspired by the phrase "bellazza necessaria" (Italian for "beautiful necessities"), which certainly applies to the Alfa Romeo Zagato Stradale TZ3.