I took the liberty of comparing a picture of the sci-fire helmet from his site with a pic of a DP Deluxe. I had to mirrow the DP DLX to get the same view but I'm pretty sure that they are different enough that it cannot possibly be a direct recast of a DP DLX helmet.

Most notably, check the t-visor and the difference in how far back it goes compared to the corner of the cheek.
Here's a pic of the original helmet from sci-fire's site.

Here is the story of the original from postmortem01 himself.
Could this be a prototype Fett helmet? Perhaps a pre-DP deluxe helmet intended for liscensing?
Can Tyler and some of the other experts shed some light on this for us?
Thanks to postmortem01 for the information. I know that I had written it off as a DP Deluxe recast but having looked closer I don't see them as being THAT close. The circular holes on the front mandibles (I have heard) are similar to the holes in the DP DLX before visor installation.