I'd say it's no longer a 1.33 ref hat. These trades getting no attention are evident of that.

http://www.tf2outpost.com/trade/4076354

http://www.tf2outpost.com/trade/3999342

http://www.tf2outpost.com/trade/4020052

http://www.tf2outpost.com/trade/3968447

http://www.tf2outpost.com/trade/4063168

At the same time, there are FAR too many sitting around asking for 1.66 ref for THAT to be accurate. I won't bother linking, a search will show the swarms. 1.44-1.55 would be more accurate. I'd lean to 1.44 due to the numbers demanding 1.66 far outweighing those interested and from my own personal experience buying one swiftly at that price a few days ago.

All of that said, the suggested price here is 1.66, which a quick search shows is leaving a good number of trades stagnant. So I'll have to disagree.