Sale @13 was a quicksell, therefore invalid, downvote.

With the seller @14 on the classies up for 3 days I think 14-15 would be a good range (the seller on OP is badly bumped which is why I wouldn't use it as the low end).

Two more sales here, sold + ks escape plan for blizz panama

http://backpack.tf/profiles/76561198160120451#!/compare/1466553600/1466640000

Thats ~15

he resold it for a stormy burning bandana + a key a day later, which is ~14 total

idk what this sale was, slick doesnt match

http://backpack.tf/profiles/76561198050726553#!/compare/1463184000/1463270400

Sold for 12, fast

http://www.tf2outpost.com/trade/28127461

http://backpack.tf/profiles/76561198085854531#!/compare/1462838400/1462924800

Sold for ~10 in stuff + 5 keys, capping at BO 14

http://www.tf2outpost.com/trade/28117109

http://backpack.tf/profiles/76561198179201573#!/compare/1461888000/1461974400

This range will be fine