1 of 1 in existence!

Sale 1:

Sold for Ghosts Thirst Blood (49*0.9) = 44.1 (rounding to 44 keys)

[no outpost trade]

http://backpack.tf/profiles/76561198129897082?time=1426921200 - before

http://backpack.tf/profiles/76561198129897082?time=1427007600 - after

http://i.imgur.com/7nq6uT6.png

Sale 2: (outlier)

Sold for Planets Peacenik's Ponytail (22*0.9) = 19.8 (rounding to 20 keys)

http://www.tf2outpost.com/trade/25574731

http://backpack.tf/profiles/76561198048365924?time=1428044400 - before

http://backpack.tf/profiles/76561198048365924?time=1428130800 - after

http://i.imgur.com/PtPCz00.png

Sale 3: (invalid sale; gifted and unpriced hats)

Sold with DaD Rimmed Raincatcher (gifted) + Sweets for Frostbite Combustible Kabuto + Stormy Brown Bomber (gifted)

http://www.tf2outpost.com/trade/25629509

http://backpack.tf/profiles/76561198150079125?time=1428476400 - before

http://backpack.tf/profiles/76561198150079125?time=1428562800 - after

http://i.imgur.com/9wESvND.png

Notes:

Hat in question: http://backpack.tf/item/3181921918

http://www.tf2outpost.com/trade/25574731 - B/O of 40 keys.

No other recent sales.

Conclusion:

One valid sale at 44 keys and an outlier at 20 keys. Taking a final value of 44 keys.

Feel free to support/counter my suggestion!

(requested by Eldric Liaz)