Last year at the annual classic car auction in Scottsdale, Ariz., a 1955 Mercedes-Benz 300 SL Gullwing sold for $4.2 million ($4.62 million with the auction house premium). It fetched such a high price because it was one of only 29 made with an aluminum body. Once you own one of these cars, the costs start to mount.For many investors looking for a bargain, restoration is a big expense. Curt Ziegler, an investment adviser in Denver, said he bought a 1956 300 SL Gullwing in 2006 for $500,000. The previous owner had done a complete restoration, he said.nce you own one of these cars, the costs start to mount. For many investors looking for a bargain, restoration is a big expense. Curt Ziegler, an investment adviser in Denver, said he bought a 1956 300 SL Gullwing in 2006 for $500,000. The previous owner had done a complete restoration, he said.
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