This model of the helmet from Darth Vader is modelled with Blender 2.71. It contains 98.552 vertices. The package comes with both the original .blend file, where all modifiers still can be changed, if wanted, and an exported .obj file if you want to use it in another 3D software than Blender.
I used both blueprints and movie sequences as references.
Some of the small details on the neck and under the helmet are my own interpretation, it may be different from the original.
No textures or normalmaps are used. Instead I used Blender internal materials and modelled the notches seperately.