Proof below. 10 month-old price.

This is actually an increase from previous suggested value.

Clean only, correct me if I'm wrong.

Sales:

http://www.tf2outpost.com/trade/15704419

-b/o of 15 buds

-looks to have sold for phos bomber (15.1)+crate #30 (1.7): http://www.tf2outpost.com/trade/15610573

-seller's bp:

http://backpack.tf/id/76561198048864903?time=1384416000

http://backpack.tf/id/76561198048864903?time=1384502400

-however, he would have accepted 15 buds, so this sale has to be counted as just 15 buds (anyway looks like outlier)

http://www.tf2outpost.com/trade/15004661

-sold for 7 buds+64 keys=11 buds

-buyer's bp:

http://backpack.tf/id/76561198035145291?time=1384329600 (new items)

http://www.tf2outpost.com/trade/14898314

-b/o of 17 buds

-sold/bought for a.f. tyrant (outdated): http://www.tf2outpost.com/trade/14844819

-13 buds

http://www.tf2outpost.com/trade/13806233

-b/o of 15 buds

-sold/bought for pe cm: http://www.tf2outpost.com/trade/14883808

-11.8 buds

http://www.tf2outpost.com/trade/16031637

-b/o of 16 buds

-sold/bought for chiro chapeau (8 suggestion is up)+disco l'inspecteur (3.4)+over bud in sweets+1 key (credits to Jesus)

-~12.5 buds

http://www.tf2outpost.com/trade/15206850

-sold for burning noble+1 bud+black bills+14 keys+27 ref it seems

http://backpack.tf/id/76561198012308971?time=1382338800

http://backpack.tf/id/76561198012308971?time=1382598000

-10.8 buds

http://www.tf2outpost.com/trade/15043916

-b/o of 14 buds

-bought duped houwar+scorching toe (outdated): http://www.tf2outpost.com/trade/15187329

-11.2 buds

Current trades:

http://www.tf2outpost.com/trade/15764114

Sales: 10.8, 11, 11.2, 11.8, 12.5, 13, 15

3 sales around 11 make the low end while a sale at 13 makes the high end. 15 should be an outlier, there also already b/os at 15. Unusual overpay and original prices used.