Sale 1:

Sold for Bubbling Dead Cone (12) + 1 key + 6 keys in metal/items

http://www.tf2outpost.com/trade/28576621 - No B/O

Seller: http://backpack.tf/profiles/76561198100565088#!/compare/1477958400/1478044800

Buyer: http://backpack.tf/profiles/76561197969035787#!/compare/1478044800/1478131200

X = 19

Sale 2:

Sold for Terror-Watt Sultan’s Ceremonial (Mini at 12 below) + >0.5 keys in metal/items

http://www.tf2outpost.com/trade/28533198 - B/O of 16

Seller: http://backpack.tf/profiles/76561198205371216#!/compare/1477612800/1477785600

Buyer: http://backpack.tf/profiles/76561198100565088#!/compare/1477612800/1477699200

X = 13

Sale 3:

Sold for Strange Spec. KS AWPer Hand (6) + Strange Battery Canteens (4 at the time) + Strange Thermal Insulation Layer (1) + Strange Conagher’s Combover (1)

No outpost

Seller: http://backpack.tf/profiles/76561198094783809#!/compare/1475971200/1476057600

Buyer: http://backpack.tf/profiles/76561198205371216#!/compare/1475107200/1475971200

X = 12

Sale 4:

Sold for ~11 keys in junk

No outpost

Seller: http://backpack.tf/profiles/76561197969035787#!/compare/1478131200/1478390400

Buyer: http://backpack.tf/profiles/76561198173416647#!/compare/1477872000/1478131200

Not the best sale to use. Gonna use this sale as support rather than to create a range.

Terror-Watt Sultan's Mini:

http://backpack.tf/suggestion/58229b0fc440453f700c00f5

Sellers:

14 keys:

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

http://www.tf2outpost.com/trade/27119590 - 1 year, 57 views, most likely closed and recently re-opened

http://backpack.tf/u/76561198067891295

http://i.imgur.com/j4gPZN9.png

http://backpack.tf/u/76561198051373842

Sales at:

19

13

12

Supporting sale at 11

19 is an outlier. Excluding 19

Going with 12-13