Recently traded this. Since there is such a low number of people who own this and are trading it, I wanted to give an update. There are only 5 of these to exist and only 1 is actively traded right now (that I was aware of).

What I was traded for this hat: http://i.imgur.com/D7ciGOq.png

Unusual Coupe D'isaster w/Scorching Flames (2 - 2.5 buds) + White Bills (10 keys) + 2 keys

In value this trade is 2.44 - 2.94 buds (it's about 1.5 keys away from being 2.5 - 3 buds)

When trading I was regularly offered the 2 - 3 bud range, so this may need a price update.