Millaista tietoa wikipediasta sitten löysit? Todettakoon että auton valmistuspäivämäärä ja myyntipäivämäärä ei tarkoita auton mallivuotta, sillä sen määrittelee valmistaja:
"date of manufacture found on the FMVSS label does not always correlate to model year since the U.S. Government allows vehicles designated for a particular model year to go on sale starting January 1st of the year prior. For example, the 1990 Plymouth Laser officially went on sale on January 1, 1989. Many of these Lasers, therefore, were manufactured in late 1988 - but were still designated 1990 models"
https://en.wikipedia.org/wiki/Chevrolet_Corvette
"Regular fourth generation production began on January 3, 1983; the 1984 model year and delivery to customers began in March 1983."