Here are some pics of cattle de-horners?
These of course are modern versions........ the sharpened outer edges show that the instrument was placed over something.......The handles pried apart, causing a scooping action. When the sharpened edges met it sheared to complete the cut.
just a guess but I won't be using it on any food 
hope 2 find out soon will get back 2 you
Good luck on finding out! Gigi
JIM