IIRC, the consensus back when it was first auctioned was that it didn't seem to match any known examples.
Maybe someone else has better pics of it? The current ebay ones are too tiny to really make out any detail.
I'm no Vader expert, but it looks to be all black, and that alone would be a pretty big difference when comparing to the screen used helmets...
The other thing of note is that the auction shows part of the receipt, but not the important part (the source!). To know who bought the piece originally is small help... with screen used props it's all about history. Knowing who Pearlman purchased from (and that person/shop's reputation) is key.
Maybe that was something listed in the bankruptcy auction?
hope that's some help
Tom