A cutter ... to cut what ?

[Rick]

I think DrD has ID'd this.
Photo 2b makes a good argument for it being a quill cutter. Quite often these little tools had a very small knife included to clear the fibers inside the quill. I wonder if the angular slots on the part marked Samson were to square the point after cutting the quill.
The sharp parts look like they'd be the very Devil to re-sharpen.