This hat should be 15 keys… One drop at a time.

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Sold for Nuts n' Bolts Le Party Phantom (18) + Bubbling Backbiter's Billycock (12):

http://backpack.tf/profiles/76561198086387300?time=1430031600 (April 26th)

http://backpack.tf/profiles/76561198086387300?time=1430118000 (April 27th)

(18 + 12) * .9 = 27 keys

Sold with 5 keys + 2 ref for Aces High Front Runner:

http://backpack.tf/profiles/76561198074999523?time=1430722800 (May 4th)

http://backpack.tf/profiles/76561198074999523?time=1430809200 (May 5th)

Using this to price Aces Front Runner.

Sold for Demonflame Stately Steel Toe (32) + Strange Specialized Killstreak Scattergun (2):

http://backpack.tf/profiles/76561198074999523?time=1430204400 (April 28th)

http://backpack.tf/profiles/76561198074999523?time=1430290800 (April 29th)

(32 + 2) * .9 = 30.6 keys

Rounded to 31 keys

Sold for Cloud 9 Stately Steel Toe (9) + 5 keys:

http://backpack.tf/profiles/76561198126134524?time=1429945200 (April 25th)

http://backpack.tf/profiles/76561198126134524?time=1430031600 (April 26th)

9 * .9 + 5 = 13.1 keys

Outlier

Sold for 30 keys:

http://backpack.tf/profiles/76561198114942834?time=1429599600 (April 21st)

http://backpack.tf/profiles/76561198114942834?time=1429858800 (April 24th)

30 keys

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Nuts n' Bolts Le Party Phantom:

http://backpack.tf/vote/id/5551c9c0b98d88b47e8b4569