https://backpack.tf/profiles/76561198130990555#!/compare/1488758400/1488844800

https://backpack.tf/profiles/76561198148929170#!/compare/1488672000/1488844800

18 pure

Now credit to Erik:

https://marketplace.tf/items/30406;5;u16

Sold for $42 ( / $2,10 ) = 20 keys

http://backpack.tf/profiles/76561198116082946#!/compare/1487548800/1487894400

http://www.tf2outpost.com/trade/28797515 - reselling with 22 key b/o

Taking from Fish above, he sold it for the Sulphurous Big Chief + 4 keys in sweets. He was reselling it with a 22 key b/o means that he didn't value it at 28+ himself either.

http://backpack.tf/profiles/76561198130990555#!/compare/1488153600/1488240000

Sold with 7 keys for a vivid noir

Mini for the Noir:

https://marketplace.tf/items/319;5;u16

Sold for $47,50 ( / $2,10 ) = 22,6 keys = 23 keys.

http://backpack.tf/profiles/76561198047609644#!/compare/1493683200/1493942400

22 keys (noir)