Mystery solved. http://forum.multitool.org/index.php/topic,13923.msg262374.html#msg262374I have a black and a green one.
I gave one of the rifle tool knives to my Dad for his military knife collection. He was so intrigued he wrote Wenger about it. I'll summarize the letter he received (tried scanning it but haven't figured that out yet).The knife was made exclusively for a Swiss company, Grunig & Elmiger AG of Malters, Switzerland (not for the Swiss military). The screwdriver is a self-center punch to adjust the diopter (sights).The letters are for the directions: left, right, up, down. (probably L-link/left; R-recht/right; T-tief/low; H-hoch/high).Here's a bit more info on the sight adjustment tool.Karl