Earlier this year, the automobile auction market, like virtually all other collectible markets, reached new highs. In May, the Uhlenhaut Coupe, a 1955 Mercedes-Benz 300 SLR, sold for $142 million. The mind-boggling sum didn’t just beat the previous mark—it demolished it by nearly $100 million and become Most Expensive Car Ever Sold at Auction. For years, the auto auction market ...