2 in existence. The hat has already been traded 4 times.

ACTUAL SALES

6.1 (6.7 in unusuals) - http://www.tf2outpost.com/trade/10939265 – sold for of samur-eye + electrostatic bonk helm

Other offers: Many offers rejected around 4-4.5

5.1 - http://www.tf2outpost.com/trade/10962586 - traded Fr-0 + bombing run for burning Spartan - http://www.tf2outpost.com/trade/10273500 - http://backpack.tf/id/76561198037105144 and http://backpack.tf/profiles/76561197978734843 (I don’t calculate reverse 10% overpay, but I will take hats at middle value)

Other offers: 8.6 (electrostatic bonk helm+of samureye+2.5 pure), 7.6 (scorching stovepipe + 4 buds) - unclear if this was for 1 or 2, ~5 (time warp snaggle + bills), 4.5 (moon jeepcap), 4 pure

? - http://www.tf2outpost.com/trade/10940040 – sold for cauldron tree + some robo keys?

Other offers: 5 (lantern milkman)

? - http://www.tf2outpost.com/trade/10914304 – sold for steaming slug + ~1 buds in sweets? + robo keys? - http://backpack.tf/id/76561198030721033?time=1368946800

Other offers: 9.5 (moon juju), 4.4 (vivid sam+blizz lucha)

Summary - going by sales rather than offers, which are all over the place

Low End: One sale at 5.1. Two sales may have occurred lower than this, but (1) it is unclear how many sweets were added and (2) there are enough offers >5 to justify that as the low end

High End: One sale at 6.1. Two offers >6.1. One was made by the guy who ended up buying for 6.1 (he added 2.5 pure to his offer on the other trade?). The other (moon juju) was made by a guy who really wants these effects and bought a cowl which he offered on the fr-0. Both offers seem anomalous given the other offers and sales.