Sale 1:

Sold for 12 keys (and a Courtly Cuirass)

http://www.tf2outpost.com/trade/28147799 - B/O of 14

Seller: http://backpack.tf/profiles/76561198085304767#!/compare/1464566400/1464652800

Buyer: http://backpack.tf/profiles/76561198252056780#!/compare/1464480000/1464566400

X = 12

Sale 2:

Sold with Ballcap for Cloud 9 Plumber’s Pipe (12.5)

No outpost

Seller: http://backpack.tf/profiles/76561198252056780#!/compare/1466899200/1466985600

Buyer: http://backpack.tf/profiles/76561198132978465#!/compare/1466812800/1466899200

X = 12 (Rounding down, because the ballcap was added)

Sale 3:

Sold for 12 keys

No outpost

Seller: http://backpack.tf/profiles/76561198132978465#!/compare/1466899200/1466985600

Buyer: http://backpack.tf/profiles/76561198134306424#!/compare/1466899200/1466985600

X = 12

Sale 4:

Sold for Terror-Watt Larrikin (17.5)

No outpost

Seller: http://backpack.tf/profiles/76561197998939874#!/compare/1464480000/1464825600

Buyer: http://backpack.tf/profiles/76561198070817567#!/compare/1464739200/1464825600

X = 18 (Rounded from 17.5)

Sellers:

13 keys:

http://www.tf2outpost.com/trade/28295944 - 1 day

15 keys:

http://www.tf2outpost.com/trade/28294893 - 2 days

http://puu.sh/pM7wQ/8e5107a96d.png – 1 month

http://puu.sh/pM7yZ/ab504611ce.png - 26 days

Sales at:

12 (3x)

18

18 is an outlier

Going with 12 flat