That helmet was used twice on screen: in ESB as hero and in ROTJ in the added scenes for the Special Edition. And that green is actually dark gray; it was also confirmed by Art when eFX cast the helmet.
Hasbro did a 3D scan of the same hero screen used ESB helm that eFX made their direct cast from, yes.
But, Hasbro seriously cleaned up the details, and made the whole thing symmetrical.
So, it's "SIZE" is pretty much the same, although Hasbro seems to be a wee big bigger, but side by side ( just snapped these two for reference), the differences are painfully obvious.
eFX Fett is on the left and Hasbro on the right . ( paint upgrade on the eFX and ROTJ re-paint on the Hasbro, both done by me).
Thanks. This is my fiber glass scratch build. When I finished it the ears were almost vertical. I wanted more flare at the bottom. I pushed on the face trying to see how it would look and it cracked on the same side as the real ESB helmet. I scored the inside, shoved in a wooden wedge and re-glassed I want to add the little wave on the top brow. I did not notice until last night, the my eye slot is a little wider on the right side, Seem the real helmet was in fact squashed a bit Still not happy with the dome...