[UPDATED]
Available at: https://www.cgtrader.com/3d-models/military/melee/survival-knife-1d56aa91-6eff-4297-bb8d-9a47ac18f8fc
Model made in Blender, Textures in Substance Painter, Rendered in Marmoset Toolbag 3.
Texture workflow: Specular-Gloss
Clean #1
Dirty #1
Clean #2
Dirty #2
Clean #3
Dirty #3
Wire-Frame #1
Wire-Frame #2