Spartan Helmet with oxidized bronze 3D model is available on CGTrader for $15. Original author: nadh22. Specs: 404520 verts.
STL (Stereolithography, filesize: 32.9 MB), OBJ (OBJ, filesize: 53.5 MB), FBX (Autodesk FBX, filesize: 20 MB), TEXTURES (Textures, filesize: 5.5 MB)