How can you verify if a 1971 Buick Skylark is a genuine GS model?

To verify if a 1971 Buick Skylark is a genuine GS (Gran Sport) model, check the Vehicle Identification Number (VIN) for specific codes indicating it is a GS. Look for the presence of GS-specific features, such as a larger engine (typically a 350 V8 or 455 V8), dual exhaust, and unique badging. Additionally, inspect the build sheet or window sticker, if available, for confirmation of GS options. Consulting Buick's production records or a knowledgeable classic car expert can also provide verification.