I second that. And also what Gino says about the ESB in general.
However the lineage of Vader Helmets is meanwhile a well explored field (f.e. the fabulous documentation on starwarshelmets.com).
Would be interesting to know from which of the main lineage branches the helmet origins.
As far as I know, the mystic TM line is still the one that brings the connaisseurs to the highest excitement due to its very direct lineage from production one.
Are we allowed to know what's the background of this helmet here? Is it a similar story?
By the way, I think the dome indeed sits like a ROTJ on the facemask. I would personally correct that. But thats just a detail. It's a very nice and proper made helmet.