Bubbling Furious Fukaamigasa

New price: 11-12 keys

[proof below]

SALE #1 = 11 keys

https://marketplace.tf/items/395;5;u34

Sold for $22.08 ( / $2,05 ) = 10.8 -> 11 keys.

SALE #2 = 12 keys

https://marketplace.tf/items/395;5;u34

Sold for $24.87 ( / $2,05 ) = 12.1 -> 12 keys.

SALE #3 = invalid

https://backpack.tf/profiles/76561198045805756#!/compare/1499990400/1500336000

Untrace.

SALE #4 = invalid

https://backpack.tf/profiles/76561198026601680#!/compare/1499040000/1499126400

Quicksold for 8.3 keys.

SUMMARY

Sales: 11 / 12 keys

Sellers: 12 / 12 keys

http://i.imgur.com/ck4zqRk.png

Sold my own for $22.99 on 23 April, 2017. Sale is nearly outdated so not including as official proof but it would support (fall in the range).

http://i.imgur.com/BzQrUEf.png

$22.99 ( / $2,10 at the time ) = 11 keys

Going with 11-12 keys.