Restoration of Rusty Knife- But What Is It For

Hello folks! Today I have the restoration of the strangest knife! I see this type of knife for the first time, and I do not know what it is for, at what angle I need to sharpen, etc. please write in the comments if you know. Thanks! Well, let's start the restoration. First of all, I removed all the plaque and green rust from the brass part of the knife, using a sandblaster. And also removed the remnants of paint from the handle of the knife. Then I took the knife apart and began the recovery process. I cleaned the old wooden handle and sanded it with sandpaper. Soaked in wax and painted with wood paint. I have sanded and polished the blade itself. But I did not make new bevels or sharpen them, because I do not know what the parameters of his knife should be. I cleaned the brass part of the knife with sandpaper, I soldered the broken parts with tin-lead solder and applied a blackening agent to hide traces of deep rust and give an older look. After all the actions, I riveted