I found this knife at a flea market and I really don't know what it's purpose is. It does say' "Made in France", it is about 4" and has a small nub on the blade. Its not that sharp. I was thinking maybe for cheese? Any ideas Chow Hounds?
When you twist the knife to pry open the shell, you don't want the sharp edge of the blade pushing against the shell. The shell on that side of the blade should rest in the notch. This also lessens the possibility of the knife slipping and causing injury to the user.