Team Fortress 2
Counter-Strike: Global Offensive
Out of 6,309,413 inventories, there is only one known instance of this item.
This item has only been seen as level 85.
I lol'd at the only previous suggestion.
Seller sold for 199.91, I bought for 229.89.
It's 5 ref, so make it 5 keys! LOGIC And it's somewhat rare so that means it should be worth more than 4 keys…