The original version of the Victorinox One-Hand Fireman Swiss Army knife is similar to the current model, but it has a plain blade instead of a serrated blade, and a standard-sized bottle opener instead of an oversize one.

Fireman-- no lock release button
Fireman One-Hand-- serrated blade, large locking screwdriver/bottle opener
Jumpmaster-- no lock release button, phillips screwdriver instead of corkscrew
One-Hand Parachutist-- no wood saw, phillips screwdriver instead of corkscrew