Carpet isntalled with nails?

I used to have a 1963 VW Beetle & the top of the carpet on the kick panels was nailed down. This was the original carpet. I had a friend who was a VW "NUT" that worked as a mechanic for a VW dealership. He said it wasn't uncommon. Still don't know if he meant the factory could have done it or just that he saw it a lot.