Sale 1:

https://backpack.tf/profiles/76561198062469137#!/compare/1500595200/1500854400

Sold for a Blizzardy Storm Otolaryngologist's Mirror (14.5) + ~1 key in ref and sweets

http://www.tf2outpost.com/trade/29271201 - B/O 14

Sale 2:

https://backpack.tf/profiles/76561198290952875#!/compare/1499558400/1499644800

QS

Sale 3:

https://backpack.tf/profiles/76561198254375254#!/compare/1499472000/1499558400

Sold for a Bubbling Prancer's Pride (~9.5)

Sellers @ 9 and 10

Buyer at 10 counters.

Sale 4:

https://backpack.tf/profiles/76561198002757046#!/compare/1499299200/1499385600

Sold for 11 keys pure

Sale 5:

https://backpack.tf/profiles/76561198086178920#!/compare/1498435200/1498608000

Sold for a Blizzardy Storm Prince Tavish's Crown (15) + 1.3 in sweets

http://www.tf2outpost.com/trade/28838004 - B/O 15

Sales:

14

11

15

Sellers:

http://www.tf2outpost.com/trade/29297229 - B/O 13, 3 weeks but has gone inactive now

http://www.tf2outpost.com/trade/29217227 - B/O 14, 2.5 months

Also, the sale for 15 took over 3 months. 15 looks high here, 11-14 should work better. ~ Marty

Going with 11 - 14