requested; 1 of 1 in existence and sold to a collector!

Sale 1: (credits to Reg for providing screenshots of the trade)

Sold for 400 keys + Burning Flames Pyromancer's Mask (300) + Burning Flames Large Luchadore (200) = 900 keys

http://www.tf2outpost.com/trade/26654184

http://gyazo.com/bd70af7b08581fafc25645c58ce0ccfb | http://gyazo.com/d550f54719393a12a9e88facae69d84c

Backpack of buyer:

http://backpack.tf/profiles/76561198065493736?time=1438326000 (July 31st)

http://backpack.tf/profiles/76561198065493736?time=1438506514 (August 2nd)

Backpack of seller:

http://backpack.tf/profiles/76561198060976608?time=1438326000 (July 31st)

http://backpack.tf/profiles/76561198060976608?time=1438506438 (August 2nd)

Notes:

Hat in question: http://backpack.tf/item/3966693069

Not applying overpay to the Burning Flames Pyromancer's Mask + Large Luchadore as those were mostly based off pure sales.

It also seems Lady Gyal was brokering the item for Japenese Culfide, making this the only valid sale.

Conclusion:

One recent sale at ~900 keys. Sold to a collector who doesn't plan to sell it any time soon; taking a final value of 900 keys.

Feel free to support/counter my suggestion!