Mesh is manifold.
Measure units are millimeters, it is about 5.5 cm in height.
Two versions of files:
1) Gnome_HeadF .blend, .obj, .stl, .fbx, .dae File contains one solid object that consists of 317436 triangular faces.
2) Gnome_Head_Parts .blend, obj. File contains parts before boolean operations are applied. (cap, ears, beard, mustache, eyeballs, hairs, etc...)
I think this head with little adjustments can be used as Santa Claus’s head.
British scientists long ago proved that Santa is just a big gnome :)
Cycles materials that was used for rendering is available in Gnome_HeadF.blend file.