Steaming Grimm Hatte

New price: 14-16 keys

[proof below]

SALE #1 = 16 keys

https://backpack.tf/profiles/76561198382076026#!/compare/1511568000/1512432000

https://backpack.tf/profiles/76561198040224815#!/compare/1511568000/1511654400

http://www.tf2outpost.com/user/76561198040224815 - no B/O

Sold for an Orbiting Planets Cloud Crasher (14) + 2 keys = 16 keys.

SALE #2 = 15 keys

https://backpack.tf/profiles/76561198382076026#!/compare/1512950400/1513209600

http://www.tf2outpost.com/user/76561198382076026 - no B/O

Sold for an Orbiting Fire Private Eye (15)

SALE #3 = invalid

https://backpack.tf/profiles/76561198040224815#!/compare/1511308800/1511395200

Better used there.

SUMMARY

Sales: 15 / 16 keys

Sellers: 14 keys

https://i.imgur.com/RSgOXVz.png

Mindacos said that the Cloud Crasher sale is better used here. Also including seller. Going with 14-16 keys.