1 month old price ;)

Sellers

2-2.11

http://www.tf2outpost.com/trade/11892945 - 2 ref,3 hours

http://www.tf2outpost.com/trade/11649370 - 2.11, 1 week

2.22-2.33

http://www.tf2outpost.com/trade/11295378 - 2.33, 2 weeks

http://www.tf2outpost.com/trade/11800911 - 2.33, 3 days

http://www.tf2outpost.com/trade/11788651 - 2.33, 3 days

http://www.tf2outpost.com/trade/10839744 - 2.33, 1 month

http://www.tf2outpost.com/trade/11781840 - 2.22, 4 days

http://bazaar.tf/trade/212239 - 2.33, 1 month

http://backpack.tf/classifieds/search/363/1/0 - 1 sellers at 2.33, 23 minutes...? :P

Buyers

http://www.tf2outpost.com/trade/11890816 - 1:1 with Ol' Snaggletooth (2 ref)

Only buyer within the current range

Sold and Offers

http://www.tf2outpost.com/trade/11514961 - Sold for 2.11 (check comments and history)

http://www.tf2outpost.com/trade/10818310 - 2 ref offer, asked for 4 more weps

ALSO: http://trade.tf/spreadsheet - If I'm right and trade.tf tracks sales, it suggests a price of 2 ref ;)

Conclusion

Removing 2.22-2.33 since these prices seem to be unsuccessful, 2.11 because of a sale and 2 because of 1 willing seller, an offer of 2 ref and a willing buyer for a 2 ref hat.

Constructive criticism is appreciated ;)