disney dreams gave you a great answer there!!
you can also use a couple of facts to help you evaluate or debate its worth while trading.
It was one of the rarest pieces of beta and often traded for 2 infernos up until people got scared off by returning beta items. It did come back as prizes in a few quests last month so its value to most did drop a little, but not much as it wasn't awarded that much.
overall, it tends to be a highly desired item and tends to trade for big offers