I think Mike is right. The Garr Klontz is probably the owners name. Guys used to stamp their name into their tools. If you think about it like this. You work in a furniture shop with 5 or 6 other craftsman, each one having their own tools. How would keep track of your tools? You are working on a bench just a few feet away from another guy and his tools. One guys hollows and rounds look just like the next guys.
It is also possible the guy made his own tools.