1 of 3 hat. none on the market. Only one valid recent sale.

Sale :

Before : http://backpack.tf/profiles/76561198067717452?time=1427871600

After : http://backpack.tf/profiles/76561198067717452?time=1428390000

Sold for a Kill-a-Watt Exquisite Rack : 63 keys * 0.9 = 58 keys

Mini on the rack :

Before : http://backpack.tf/profiles/76561198123333904?time=1428994800

After : http://backpack.tf/profiles/76561198123333904?time=1429167600

Sold for Knifestorm Nanobalaclava ( 60 keys ) + a gifted orbiting fire spartan ( 10 keys ) = 70 * 0.9 = 63 keys

Mini on the gifted spartan :

Before : http://backpack.tf/profiles/76561198098270084?time=1429340400

After : http://backpack.tf/profiles/76561198098270084?time=1429655453

Sold for a Miami Nights Helmet Without a Home = 11 keys * 0.9 = 10 keys

Rounding up to 60 keys.

Supportive criticism welcome