I was liberating some old hand tools from my grandfather's shop again, before grandma throws them in the garbage, and found some more interesting things. This time I am sure that this one is a woodworking tool!
It looks like a tool that's a tapering tool that could be used to make tenons on chair legs or something similar. It seems clear that it is meant to be used in a brace. Seems hard to try and cut a tenon though as I would think the tool would easily drift.
Following is the only markings on the tool as well as a view from the bottom that shows the blade.
What do you think this is called and more importantly what is it used for?