Check out Katana Samurai Sword - Honjo Masamune - Realistic Weapon Low-poly 3D model on CGTrader for $15. High-quality mesh by chuwakcz: 8090 polys, 4606 vertices. PBR, Textured, UV Mapped.
STL (Stereolithography, filesize: 2.09 MB), OBJ (OBJ, filesize: 2.09 MB), FBX (Autodesk FBX, filesize: 2.09 MB), DAE (Collada, filesize: 2.09 MB), TEXTURES (Textures, filesize: 96.5 MB)