It's not a shaving knife or razor. The tip of the blade was designed long ago for those who only had one arm. Simply use the tip to catch the edge of your pocket and the knife opens. So I guess you can say the knife is a very old design of one hand opening.
Thanks for the lesson! That is a really cool shape and awesome functionality. Love the way this one looks. Now need to get a GEC with this blade. It never ends.