This is an incredibly rare and extremely recognizable piece. This original screen used Darth Vader helmet looks amazing with the clear cast face mask that was made for display.
The helmet was acquired from a Special Effects person who had it for approximately 10 years. Prior to that, he had purchased it from another Special Effects person who obtained it from a stage hand after the helmet received a blow during the saber fight and only the top helmet part was exchanged (since the face was still intact).
You can see that the helmet is very complete, and has a crack on the left side (see the fourth picture from the top). The surface has several scratches, small cracks, and chips (note some in the middle of the brow) from screen use.