Bubbling Hustler’s Hallmark

New price: 12 keys

[proof below]

SALE #1 = 12 keys

https://marketplace.tf/items/146;5;u34

Sold for $23.78 ( / $2,05 ) = 11.6 -> 12 keys.

SALE #2 = invalid

https://backpack.tf/profiles/76561198301326229#!/compare/1500163200/1500249600

https://backpack.tf/profiles/76561198110951310#!/compare/1500249600/1500336000

Untrace.

SALE #3 = invalid

https://backpack.tf/profiles/76561198094730000#!/compare/1500508800/1500595200

Went to Lila so high likely quicksold to him through the buy order.

SALE #4 = invalid

https://backpack.tf/profiles/76561198107026626#!/compare/1496188800/1496275200

Went to a quickbuy bot.

SALE #5 = 11 keys

https://backpack.tf/profiles/76561198069947128#!/compare/1501372800/1501459200

Sold for a Blizzardy Storm Shooter's Topi (11)

Mini Blizzardy Storm Shooter's Topi = 11 keys

https://backpack.tf/profiles/76561198197970201#!/compare/1498780800/1498953600

Sold along 5 keys in sweets for a Nuts n' Bolts Party Phantom (16) = 11 keys.

SUMMARY

Sales: 11 / 12 keys

Sellers: 12 / 12 keys

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

Going with 11-12 keys.