Ford built 5,262 20th Anniversary GT350 hatchbacks and convertibles 24 years ago. Because few people know what these cars are today, value is currently soft. In time, they will become good investments. This '84 20th Anniversary turbo convertible is one of only 104 produced. It recently sold for less than $10,000. We expect these cars to become good investments as Generation X grows older and more nostalgic.