$9 Helmets and shields pack Vol1 Low-poly 3D model by monkeypunk-studio. Available on CGTrader with 15000 polys and 10000 vertices. Check it out on CGHub.
STL (Stereolithography, filesize: 448 KB), OBJ (OBJ, filesize: 259 KB), FBX (Autodesk FBX, filesize: 5.12 MB)