Corinthian Helmet 3D model is available on CGTrader for $4. Original author: cpolak02. Specs: 11495 polys, 13146 verts.
STL (Stereolithography, filesize: 42.9 MB), OBJ (OBJ, filesize: 42.9 MB), FBX (Autodesk FBX, filesize: 42.9 MB), DAE (Collada, filesize: 42.9 MB)