10 months

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Sold for Bubbling Defiant Spartan (14) + Genuine Point and Shoot (1.7):

http://backpack.tf/profiles/76561198118694875?time=1431241200 (May 10th)

http://backpack.tf/profiles/76561198118694875?time=1431327600 (May 11th)

(14 + 1.7) * .9 = 14.13 keys

Rounded to 14 keys

Bulk sale for Something Burning This Way Comes Pampered Pyro:

http://backpack.tf/profiles/76561198018404472?time=1431154800 (May 9th)

http://backpack.tf/profiles/76561198018404472?time=1431241200 (May 10th)

Sold for 12 keys:

http://backpack.tf/profiles/76561198034747176?time=1428303600 (April 6th)

http://backpack.tf/profiles/76561198034747176?time=1428908400 (April 13th)

12 keys

Sold for Stormy Storm Berliner's Bucket Helm (12):

http://backpack.tf/profiles/76561198066963919?time=1429599600 (April 21st)

http://backpack.tf/profiles/76561198066963919?time=1429858800 (April 24th)

12 keys

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Stormy Storm Berliner's Bucket Helm:

http://www.tf2outpost.com/trade/25869393