This shouldn't be 12 keys flat.

Counter Suggestion to: http://backpack.tf/vote/id/558ab537b98d88452b8b463e

Credits to HarryG for sale #2, #3 & the mini suggestions

Sale #1:

Bought mine for a Circling TF Logo Madame Dixie and a Diamond Botkiller Scattergun Mk.I:

http://m.imgur.com/s1tlkmJ

Proof of the effect on the Dixie: http://m.imgur.com/WXGxRRL

Proof of effect on the Fukaamigasa: http://m.imgur.com/dYvkAoA

Proof of the Scattergun: http://m.imgur.com/nPT8PVw

Total: ~14 keys (No overpay as I offered, no Outpost trade made with buyout)

Sale #2:

Sold for an Australiam Frontier Justice and a key:

Seller's backpack before: http://backpack.tf/profiles/76561198086586048?time=1432364400

Seller's backpack after: http://backpack.tf/profiles/76561198086586048?time=1432450800

Total: 12 keys (not applying overpay on the australiam)

Sale #3:

Sold for a Smoking Lord Cockswain's Pith Helmet:

Seller's backpack before: http://backpack.tf/profiles/76561198081926088?time=1432623600

Seller's backpack after: http://backpack.tf/profiles/76561198081926088?time=1432710000

Total: 14 keys (no overpay due to overpay being already applied in the mini suggestion on the Kill-a-Watt Flipped Trilby)

Mini Suggestion on the Pith Helmet since it has an outdated price:

Sold for a Kill-a-Watt Flipped Trilby:

Seller's backpack before: http://backpack.tf/profiles/76561198081926088?time=1432710000

Seller's backpack after: http://backpack.tf/profiles/76561198113302325?time=1434006000

Total: 14 keys (no overpay applied as overpay has already been applied on the mini suggestion below)

Mini Suggestion on the Trilby since it has an outdated price:

Sold for a Terror-Watt Honcho's Headgear:

Seller's backpack before: http://backpack.tf/profiles/76561198140425534?time=1433746800

Seller's backpack after: http://backpack.tf/profiles/76561198140425534?time=1433833200

Total: 16*0.9 = 14.4 keys

Valuing it at 14 keys after rounding to the nearest integer

Please tell me if I did anything wrong on this suggestion, thanks.