Blizzardy Storm Lord Cockswain's Pith Helmet

Sale 1: 15 keys pure

https://backpack.tf/profiles/76561198114402400#!/compare/1525392000/1525478400

https://backpack.tf/profiles/76561198069122042#!/compare/1525392000/1525478400

Sale 2: Sold for C9 Bombing Run (13)

https://backpack.tf/profiles/76561198334066390#!/compare/1526515200/1526688000

Mini: https://backpack.tf/suggestion/5b1b9bd744325a380339c2fa

Sale 3: 11 keys + 13 refined; rounding to 11

https://backpack.tf/profiles/76561198070067663#!/compare/1524268800/1524441600

Sale 4: 12 keys (QS sold after 1 day)

https://backpack.tf/profiles/76561198070067663#!/compare/1524441600/1524528000

Sale 5: Sold for Strange Professional Killstreak Sniper Rifle (9.5) + 2 keys pure + 17 refined --> ~12

https://backpack.tf/profiles/76561198087042029#!/compare/1527292800/1527379200

Sale 6: Sold for Stormy Storm Lord Cockswain's Pith Helmet (12)

https://backpack.tf/profiles/76561198124439548#!/compare/1523923200/1524009600

Mini: https://backpack.tf/suggestion/5b1b9c02cf6c7558300aeacd

Sale 7: Bulk

https://backpack.tf/profiles/76561198114402400#!/compare/1524614400/1524700800

https://backpack.tf/profiles/76561198339336870#!/compare/1524614400/1524700800

Sale 8: Cashout

https://backpack.tf/profiles/76561198052389363#!/compare/1526256000/1526774400

Sellers starting at 14; buyers at 11 https://i.imgur.com/9pjx8Q6.png

Sales at: 12, 13, 15. Sales at 11 are countered by buyers.

Suggesting range from 12 to 15.