Terror-Watt Noble Amassment of Hats

All credits to Mindacos

Sold for 20 Keys

https://backpack.tf/profiles/76561198150783829#!/compare/1519344000/1519430400

Sold for 18 Keys

https://backpack.tf/profiles/76561198309838525#!/compare/1520553600/1520640000

Sold for 20 Keys

https://backpack.tf/profiles/76561198155320889#!/compare/1523145600/1523232000

Sold for a Green Confetti Magistrate's Mullet(9.25 Keys) and ~10.5 Keys in Sweets(~19.75 Keys total, round to 20)

https://backpack.tf/profiles/76561198020572390#!/compare/1520812800/1520899200

Sold for an Orbiting Fire Furious Fukaamigasa and ~2 Keys in Sweets

https://backpack.tf/profiles/76561197993422884#!/compare/1525305600/1525392000

Low outlier. Supports 18.

Sold for a Green Confetti Desert Marauder(15 Keys) + 6 Keys(21 Keys total)

https://backpack.tf/profiles/76561198309838525#!/compare/1520467200/1520553600

https://backpack.tf/profiles/76561198116653058#!/compare/1520294400/1520812800

18-21.