The original version of the Wenger Alpine Backpacker Swiss Army knife is similar to the modern Alpine Backpacker, but it has a plain blade instead of a serrated one.

Alpine Backpacker Serrated-- serrated blade
Backpacker II-- small blade instead of nail file
Camper-- adds toothpick and tweezers
Commander-- no scissors
Outback-- phillips screwdriver instead of corkscrew

Camper-- small blade instead of nail file, adds toothpick and tweezers