Buick's most iconic muscle car, the GSX is also among the rarest. The company sold only 678 units during the 1970 model year.
Previously part of a massive car collection, this 1948 Buick Roadmaster reportedly spent 20 years exposed to the elements.
Buick Grand National and especially the GNX, but there was little-known Regal-based turbo-six coupe that preceded them.
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