This hat is 3good4y0u.

Sale 1

Sold for a Miami Cone (140) + duped PE Kabuto (mini at 145) + Cloud 9 Front Runner (mini at 40) + T-Watt Prospector (using current price of 12.5)

http://backpack.tf/profiles/76561197964393843#!/compare/1475971200/1476057600 ---- Keys were not involved.

http://www.tf2outpost.com/trade/28355103#latest ----- B/O was 350 keys.

http://imgur.com/a/25Ke3 ----- You can see the effects using the compare link

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Mini for the duped Kabuto: 1) Sold with 30 keys + Green Confetti Stuntman (~10) for a DBD Cone (185)

http://backpack.tf/profiles/76561197964393843#!/compare/1476835200/1476921600

http://backpack.tf/profiles/76561198112612121#!/compare/1476835200/1476921600

http://imgur.com/a/sONZB ----- You can see the effects using the compare links.

2) Sold with a Phosphorous Oiled Baker (outdated at 29.5) for a Scorching Ground Control (200)

http://backpack.tf/profiles/76561198011134507#!/compare/1476403200/1476576000

http://backpack.tf/profiles/76561198039731024#!/compare/1476489600/1476576000

3) Sold for a T-Watt Viewfinder (outdated at 120) + 3 keys

http://backpack.tf/profiles/76561198214049309#!/compare/1474502400/1474588800

Sales for ~120, 145, ~170. I will just take 145, which is mid-range.

Mini for the Front Runner: Could only find bulk and quick sales. Outdated at 44, unbumped seller for 35, sellers for 40, 44 and 45. Taking 40.

http://imgur.com/a/p7oGS

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=======> 140 + 145 + 40 + 12.5 = 337.5 = Rounding to 340 keys

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Sellers

- http://www.tf2outpost.com/trade/28535707 ----- 800 keys

Summary

- Sale for 340.

Going with 340 keys. Criticism appreciated!