I got bored and decided to do a suggestion for a random unusual.

It was hard to find proof on trades, but I've found the proof from item histories. Note: this doesn't show any other pure that could have been involved.

All proof is around the 1.8-2 bud range

http://www.tf2outpost.com/item/440,2447643442,319,5 & http://www.tf2outpost.com/item/440,2444552416,108,5 Meemaws and hawk7, Noir worth 1.6-2 buds, last updated 6 months ago, refresh to Noir price?

http://www.tf2outpost.com/item/440,2425641154,161,6 http://www.tf2outpost.com/item/440,2425641254,55,5 & http://www.tf2outpost.com/item/440,2329493939,108,5 Smart! & Hopesfall, Bubbling Fedora worth 1.2 buds, big kill 12-13, making it about 1.8 buds edit: just saw that the Big Kill is a Spec. Killstreak, adding a couple keys makes the range: 1.8-2 buds

http://www.tf2outpost.com/trade/18657762 wanting to sell set for 4.5-5 buds, traded with Cloud 9 Familiar fez, was 4.5-5.2 buds at the time, now is 2.8-3 buds. With the amby being australium, and 1 bud currently, either it was 3.5-4 buds with their price, or 1.8-2 buds now. Average of 2 is 2.8 buds. & http://www.tf2outpost.com/item/440,2449641306,223,5 & http://www.tf2outpost.com/item/440,2449222388,108,5 SpiderSteve and hyungchong02 & http://www.tf2outpost.com/trade/18675197 The guy who bought the set is now try to sell it for 3 buds, making him agree that its around 2 buds.

http://www.tf2outpost.com/item/440,2396804977,108,5 & http://www.tf2outpost.com/item/440,2444552892,671,5 hawk 7 and Rawry, Bomber worth 2.1-2.4 buds

Sellers

Have B/Os of 3 buds: http://www.tf2outpost.com/search/199789410 (It says Smart! doesn't own the hat anymore, but he still has a trade up)

I know it's not too much, but this is the only valid recent proof I could find and I think it may be enough to set it's price (unlike the other suggestions for this hat with no proof at all)