In this image, it shows a shoemaker working with the half-moon knife. In the first portion, it shows the shoemaker in action using it to cut the leather that will be used for the shoes.
This is another example of the half-moon knife that was used specifically to cut leather. It is made from iron, and is used in leather work. It is measured as having a height of 120 mm, and a width of 160 mm.