A Porsche 911 Type 993 Turbo completed the day Ferry Porsche died is to be auctioned at Bonhams Goodwood sale in the U.K.

Not only does the car feature a unique dedication to the company's boss, it also happens to be the final 993 to built at the factory. Porsche aficionados may recall that officially the last 993 was a Carrera 4S that was delivered to Jerry Seinfeld after being completed on March 31, 1988. However, this example was a very special order and stayed in Zuffenhausen for a further six months with the Sonderwunsch department.

Fitted with a WLS 2 M64.60 engine producing the same 450 hp as the Turbo S, the car also got a strut brace, twin-pipe exhaust, an extra oil cooler and a larger 92-liter fuel tank. The wide body is finished in Ocean Blue with the Brembo brake calipers painted to match, while the interior is trimmed in Night Blue leather.

The buyer, German author Clauss Vanderborg, opted to have the rear wiper and car phone deleted. Two special plaques were fitted. The first commemorates the passing of Ferry Porsche with the words "In memoriam Prof Ferry Porsche" and a quote in German from the 1944 film Die Feuerzangenbowle (The Fire-tongs Bowl) that says, "Only the memories we carry with us are real, the dreams we spin and the desires that drive us true. But with that we can be satisfied." The second plate reads, "Clauss Vanderborg today received the last classic Porsche 911 (993 Turbo) with an air-cooled Boxer engine. The beat is yours forever!"

Ever the romantic Vanderborg named the car "The Last Waltz" with the wording appearing on the sills and a rear window sticker.

Despite waiting a long time for his special 911 to completed Vanderborg sold it on to a collector in Japan within a year. In 2015 it was bought by a Belgian dealer who kept it for two years. The Last Waltz then spent some time in the U.K. before finding a home in Belgium once more.

Now for sale with just over 11,000 km on the odometer Bonhams estimates it will sell for £700,000-£800,000 ($919,300-$1.05 M).