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In 1968, 992 (Corvette Bronze) was availible with STD (black vinyl) trim. I'm guessing this is what you have? If so, F18 is the body production date code, January 18 1968. http://corvettec3.ca/interior.htm
You'd need to find someone with a very specific car that is missing a trim tag. There are also counterfeit trim tags floating around. You can often tell the difference by the shape of the "C" in "Chevrolet". If you post a photo, someone should be able to tell the difference.