Sale 1:

Sold for Disco Beat Down Prospector (14.5)

No outpost

Seller: http://backpack.tf/profiles/76561197988155310#!/compare/1493337600/1493510400

Buyer: http://backpack.tf/profiles/76561198344003736#!/compare/1493424000/1493510400

X = 15

Sale 2:

Sold for Peace Sign Topi (11.5) + 2 keys

No outpost

Seller: http://backpack.tf/profiles/76561198344003736#!/compare/1494028800/1494115200

Buyer: http://backpack.tf/profiles/76561198107120524#!/compare/1494028800/1494115200

X = 14

Sale 3:

Sold for 13 keys in about a day

http://www.tf2outpost.com/trade/28815272 - B/O of 13

Seller: http://backpack.tf/profiles/76561198073429334#!/compare/1488672000/1488758400

Buyer: http://backpack.tf/profiles/76561198149751838#!/compare/1488758400/1488844800

X = 13

Sale 4:

Sold for 13 keys

No outpost

Seller: http://backpack.tf/profiles/76561198108148076#!/compare/1489968000/1490054400

Buyer: http://backpack.tf/profiles/76561198205843209#!/compare/1489881600/1491004800

X = 13

Sale 5:

Sold for trash

Seller: http://backpack.tf/profiles/76561198304001962#!/compare/1493683200/1493856000

Buyer: http://backpack.tf/profiles/76561198351689658#!/compare/1493769600/1493856000

Best not to get an exact figure out of this trash.

Sale 6:

Sold for Terror-Watt Bombing Run

Seller: http://backpack.tf/profiles/76561198143581382#!/compare/1488672000/1488844800

Buyer: http://backpack.tf/profiles/76561198280113913#!/compare/1487289600/1488844800

Can be used on bombing run, assuming it's not an outlier there.

Sale 7:

Sold for Logo Mongolian

Seller: http://backpack.tf/profiles/76561198280113913#!/compare/1488844800/1488931200

Buyer: http://backpack.tf/profiles/76561198153088409#!/compare/1488844800/1488931200

Can be used on Mongolian, assuming it's not an outlier there. (will be dependent on whether the guy had a B/O)

Sales at:

13 (2x)

14

15

Buyer at 11:

http://i.imgur.com/Z7RgzO8.png

Sale 4 took a couple days to sell, don’t think excluding 13 based on the one ‘quicksell’ at 13 is a good idea. Also kinda compensates for the high-end being based off a sale at 14.5 rounded up to 15.

Going with 13-15.