AT-AT Driver helmet in the real movie gray color as per StarWarsHelmets Original AT-AT Helmet Review: [link]
. It is a a superb helmet, really heavy and sturdy. It feels like a real AT-AT Driver helmet should. One of my favorite SW helmets, these pics simply don't do it justice.
It has some very sharp details compared to others which are softer. I have TK-4510 decals on it plus some original greeblies like BOC syphons. It also has Elvistrooper metal greeblies. I still need to upgrade some of the existing greeblies like the clock parts on the forehead, the 2 black squares next to the eyes and the colored buttons on top.
As Jez said this is not sure to be made by eFX since the only original remaining one is in private hands.