these taleworlds-rascals are using the same textures for quite a couple of different weapons (only 3 texture images for all weapons!)
they simply put uv maps on them wherever they need the textures from. Since texturemaps/images eat up a lot of space: that´s a really damn clever way to save the overall filesize
here´s f.e. a spear with metal part on the right and wood part on the left, the white grid is the uv map