German Close Helmet - Maximilian - Mantelhelm 3D model is available on CGTrader for $8. Original author: Cad-Saad.
MA (Autodesk Maya, filesize: 51.6 MB), OBJ (OBJ, filesize: 94.2 MB), FBX (Autodesk FBX, filesize: 16.8 MB), GLTF (glTF, filesize: 22.3 MB), STL (Stereolithography, filesize: 42.7 MB), BIP (KeyShot, filesize: 26.3 MB)