Something in between a Mini train.

Stormy Storm Noble Amassment of Hats

Sale 1

Sold for 17 keys

https://backpack.tf/profiles/76561198002757046#!/compare/1542931200/1543017600

Sale 2

Sold for 19 keys

https://backpack.tf/profiles/76561198168760012#!/compare/1546473600/1546560000

https://backpack.tf/profiles/76561198823014931#!/compare/1546041600/1546560000

Sale 3

Sold for 20 keys

https://backpack.tf/profiles/76561198021272428#!/compare/1546041600/1546128000

https://backpack.tf/profiles/76561198814074740#!/compare/1546041600/1546300800

Sellers:

14 days @ 19 keys, https://backpack.tf/item/6760542908

Buyers:

1 day @ 16.89 keys

5 days @ 16.86 keys

9 days @ 16.82 keys

1 day @ 16.79 keys

25 days @ 16.71 keys

Sales: 17 / 19 / 20

Excluding 17 because it's just above buy orders and almost outdated.

Going with 19-20 here.