CHICAGO (REUTERS).- Some car enthusiasts prefer black – some red. But a buyer at a Michigan auction Saturday got a truly one-of-a-kind color — transparent. The 1939 Pontiac Deluxe Six “Ghost Car,” first displayed at the New York World’s Fair and later at the Smithsonian Institution, was sold Saturday for $308,000. Originally built for $25,000, the car with a Plexiglas body was the first transparent car built in America. Another was built the following year, but its whereabouts are unknown. “This is the only one known to exist,” said Alain Squindo, a car specialist for RM Auctions, which held the auction for the “Ghost Car” and other specialty vehicles in Plymouth, Mich. “It’s a very original car.” The Ghost Car was first displayed at the 1939/1940 New York World’s Fair, Squindo said. It toured a number of dealerships, and then was at the Smithsonian in