I may fail at pricing all of them at once, but I will succeed at pricing them individually.

Invalid sellers at 1.33 (In case people still say that it's easy to get this at 1.33)

http://www.tf2outpost.com/trade/20784281 (Inactive, never bump)

http://www.tf2outpost.com/trade/20772366 (Inactive, never bump)

http://www.tf2outpost.com/trade/20398926 (Inactive, have 1 buyer waitng)

Quick-sold for 1.33

http://www.tf2outpost.com/trade/20758078

http://www.tf2outpost.com/trade/20791659

http://www.tf2outpost.com/trade/20783271

Sold for 1.44

http://www.tf2outpost.com/trade/20439300

Sold for 1.66

http://www.tf2outpost.com/trade/20439300

http://www.tf2outpost.com/trade/20610382

http://www.tf2outpost.com/trade/20572103

http://www.tf2outpost.com/trade/20748213

http://www.trade.tf/trade/520860509

http://www.trade.tf/trade/520899447

Sold for 2.00

http://www.tf2outpost.com/trade/20596613

Conclusion: Before you say something stupid like "Not enough proof, downvote", take a look on the market first, this thing is so rare now. Demand > Supply because supply of craft hats went down and it's reasonable for this thing to rise. Oh, 1.66 sales overnumber 1.33 sales and 1.33 go so fast so it's perfect for a flat.

Feel free to counter / support my proofs.