Cinema Secrets made the screen-used masks for Halloween Resurrection (Halloween 8) in 2002. Their retail masks came from the same molds, so your mask is wildly accurate to the 8th movie.I'm not sure which movie the Cinema Secrets is from, but I have one and it's dated 2002. The latex is pretty thick on it and the hair is solidly glued into place. Also, it's painted a kind of dirty grey. I bought mine in Burbank (home of Cinema Secrets) but the below website seems to carry the same one (the site uses frames, so click "Licensed Horror" at the top then scroll down to "Halloween").
For about $50 bucks, I'm pretty happy with it even if it's not wildly accurate to the first movie. Also, I have a pretty big head and it fits a LOT better than the Don Post one I have from 1986.
By the way, mine is less yellow than their photo indicates.