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

Selling for 1.33

http://www.tf2outpost.com/trade/20824987 (Young, poorly bump)

http://www.tf2outpost.com/trade/20816229 (Young, poorly bump)

Selling for 1.55

http://www.tf2outpost.com/trade/20830405 (Young)

Selling for 1.66

http://www.tf2outpost.com/trade/20738195 (Poorly bump)

Sold for 1.66

http://www.tf2outpost.com/trade/20625642

http://www.tf2outpost.com/trade/20599645

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. Conservative bump because there is a valid seller under 1.66.

Feel free to counter / support my proofs.