Sold with Max's Severed Head (26) + 20 keys for Haunted Phantasm Jr Neckwear Headwear (165):

http://www.tf2outpost.com/trade/26582626

http://i.gyazo.com/7b9cc1724d1a35ab44aa1cc4c200d990.png

http://backpack.tf/profiles/76561198094066374?time=1437721200 (July 24th)

http://backpack.tf/profiles/76561198094066374?time=1437807600 (July 25th)

http://backpack.tf/profiles/76561198094066374?time=1437807600&compare=1437721200

165 - 20 - 26 = 119 keys

~120 keys

Haunted Phantasm Jr Neckwear Headwear:

^ click here to go on an adventure of mini-micro-nano-pico-femto suggestions.

Sold for CSGO items?

http://www.tf2outpost.com/trade/25892142

http://backpack.tf/profiles/76561198043961035?time=1438066800 (July 28th)

http://backpack.tf/profiles/76561198043961035?time=1438585200 (August 3rd)

http://backpack.tf/profiles/76561198043961035?time=1438066800&compare=1438585200

Sold for duped Burning Flames Troublemaker's Tossle Cap (~137.5) + Haunted Ghosts Pugilist's Protector (21):

http://www.tf2outpost.com/trade/26743104

http://backpack.tf/profiles/76561198094066374?time=1439276400 (August 11th)

http://backpack.tf/profiles/76561198094066374?time=1439449200 (August 13th)

http://backpack.tf/profiles/76561198094066374?time=1439276400&compare=1439449200

(137.5 + 21 ) * .9 = 142.65

~140 keys

Ignoring buyout as the hat sold quickly for more. Providing a range also gives more confidence in this suggestion.

Mr.JoJo is ✪ViиcΣ✪'s broker.

Duped Burning Flames Troublemaker's Tossle Cap (the joy!):

No usable sales.

------

Duped sales:

Sold with Strange Australium Axtinguisher + 1 key for Sunbeams Allbrero (unpriced):

http://www.tf2outpost.com/trade/26577620

http://backpack.tf/profiles/76561198096683150?time=1437807600 (July 25th)

http://backpack.tf/profiles/76561198096683150?time=1437894000 (July 26th)

http://backpack.tf/profiles/76561198096683150?time=1437807600&compare=1437894000

Sold with Overclocked El Jefe (42) + ~23 keys in items for Sulphurous Brotherhood of Arms (260):

http://www.tf2outpost.com/trade/26348742

http://www.tf2outpost.com/trade/26377008

http://www.tf2outpost.com/trade/26358859

http://backpack.tf/profiles/76561198135245669?time=1437116400 (July 17th)

http://backpack.tf/profiles/76561198135245669?time=1437202800 (July 18th)

Buyout of 125 keys

Sold for ?

http://backpack.tf/profiles/76561198027544408?time=1435474800 (June 28th)

http://backpack.tf/profiles/76561198027544408?time=1435561200 (June 29th)

http://backpack.tf/profiles/76561198027544408?time=1435561200&compare=1435474800

http://backpack.tf/profiles/76561198045317726?time=1435474800 (June 28th)

http://backpack.tf/profiles/76561198045317726?time=1435561200 (June 29th)

http://backpack.tf/profiles/76561198045317726?time=1435561200&compare=1435474800

Sold for Massed Flies Hive Minder (credits to Randy):

http://www.tf2outpost.com/trade/26680851

http://backpack.tf/profiles/76561198068736138?time=1438498800 (August 2nd)

http://backpack.tf/profiles/76561198068736138?time=1438585200 (August 3rd)

http://backpack.tf/profiles/76561198068736138?time=1438498800&compare=1438585200

One year outdated price at 330 keys, no recent traceable sales. Excluding this sale.

Feel free to support/counter my suggestion!

Good suggestion, upvote!