Orbiting Fire Old Guadalajara

Selling:

https://imgur.com/a/AxwtZ

4 days @ 12

22 days @ 15

Sale 1:

https://backpack.tf/profiles/76561198028305750#!/compare/1501372800/1501459200

Sold for 14 keys

X = 14

Sale 2:

https://backpack.tf/profiles/76561198075581853#!/compare/1504828800/1504915200

Sold for 15 keys

X = 15

Sale 3:

https://backpack.tf/profiles/76561198039845104#!/compare/1506297600/1506470400

Sold for a Strange Haunted Beep Man (17.5) + 2 keys

17.5 + 2 = 19.5

X = 20

Sale 4:

https://backpack.tf/profiles/76561198162282453#!/compare/1504828800/1504915200

Sold for 15 keys

X = 15

Sale 5:

https://backpack.tf/profiles/76561198159855421#!/compare/1502323200/1502409600

http://www.tf2outpost.com/trade/29309107 - B/O of 14

Sold for a Searing Sultan’s (13, indate) + 4 keys

X = 14 (capped by B/O)

Sale 6:

https://backpack.tf/profiles/76561198224892448#!/compare/1503705600/1503792000

Sold for a Blizzardy Larikin (13.5, indate but aged seller at 11.6, taking 12 https://imgur.com/a/nByPa )

X = 12

Sale 7:

https://backpack.tf/profiles/76561198260815132#!/compare/1503878400/1503964800

https://backpack.tf/profiles/76561198053747026#!/compare/1503878400/1503964800

Sold for 12 keys 8 ref

X = 12

Sale 8:

https://backpack.tf/profiles/76561198260815132#!/compare/1503964800/1504051200

Sold for an SGG Deep Fried

Should be used there

Sale 9:

https://backpack.tf/profiles/76561198372051576#!/compare/1504310400/1504396800

Added Buds for a Stormy Festivizer

Should be used there

Sales at:

12 (x2)

14 (x2)

15 (x2)

20

Summary:

20 is a clear outlier, excluding it.

Final Price: 12 - 15 keys