This specific 3D model, "Viking shield 3D model 11", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
Usage of this 3d asset is subject to the "Unknown license" agreement.
STL (Stereolithography, filesize: 1.6 MB), OBJ (OBJ, filesize: 9.94 MB), IGE (IGES, filesize: 2.87 MB), SLDPRT (SolidWorks, filesize: 799 KB), 3DS (3D Studio, filesize: 3.26 MB), 3DM (Rhinoceros 3D, filesize: 1.4 MB), FBX (Autodesk FBX, filesize: 1.35 MB)