CLIPPPER YEAR TITLE FOR CHAISS VIN #

[bigray]

My title says that my Clipper is a 1979; however, when I decipher my vin number it indicates that the chassis was a 1978. Perhaps my chasis was produced in late 1978 and the Clipper was assembled in early 1979.

How do I make certain?

What is used to determine model year. I asked primarily because in 1978 over 1,000 Clippers where produces. However in 1979 around 350 were produced. I'm trying to figure out which group my girl falls into.