I think on the Deville's it's changed over time. (but i'm no expert). Probably from when it changes over from Sedan deVille to just Deville.

I'm also no expert on the Beetles...but didn't that change over time too (early 70's)?

These older brochures list the VW line up as: Sedan, Fastback, Squareback, Station Wagon, Campmobile. I was looking at 69-70 full line ups. Later one's list Beetle and the Fastback as Type 3.

http://www.thesamba.com/vw/archives/lit/type1_2.php