Credit to Mindacos

Stormy Storm Big Country

Sold for $31.54 and $33.33 on Marketplace(~16 Keys using 1.95 value and ~17 Keys using 1.97 value respectively). 17 is an outlier.

https://marketplace.tf/items/382;5;u29

Sold for an Australium Pro KS Ambassador(~13 Keys) and ~3 Keys in Sweets(B/O was 15)

https://backpack.tf/profiles/76561198045466865#!/compare/1510099200/1510185600

http://www.tf2outpost.com/trade/29394300

Sold for a Smoking Officer's Ushanka(~12 Keys)*

https://backpack.tf/profiles/76561198045466865#!/compare/1510790400/1510876800

*No possible mini on the Ushanka and it's barely outdated. Using 12.

12-16.