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While the redesign gave the Corvette a fresh look for the new model year, Chevrolet also recognized the importance of commemorating the car's quarter-century of production.  For the first time in the brand's history, two special-edition Corvettes were introduced for the 1978 model year: the Silver Anniversary Edition and the Indy Pace Car coupes. On March 15, 1977, the 500,000th Corvette rolled off the assembly line at Chevrolet's St. Louis manufacturing plant. 
Download this 1978 Corvette Dealers Sales Brochure for a quick look at the features of the car. The 25th Anniversary Corvette. It stands alone today as it has since the summer of 1953, a truly unique and finely machined two-seater, America's only true production sports car...
The 1978 Silver Anniversary Edition Corvette was developed to offer consumers a “collectible” model that commemorated one of Corvette’s milestone production anniversaries (its twenty-fifth anniversary in this case) in a way that had ever been done previously with any Corvette model year that had come before it. The car was mechanically identical to 1978 counterparts.