I think this misc really just needs a drop to regular craft hat price, there are very few people willing to pay 1.66 and very few sellers at that price who are successful.

Unsold for more than 1.33:

http://www.tf2outpost.com/trade/16416331 (Very new trade)

http://www.tf2outpost.com/trade/16317203

http://www.tf2outpost.com/trade/16403910

http://www.tf2outpost.com/trade/16397065

http://www.tf2outpost.com/trade/16077434

http://www.tf2outpost.com/trade/16363194

Selling for 1.33 (Craft hat price!)

http://www.tf2outpost.com/trade/16403768

http://www.tf2outpost.com/trade/16193836 (Poorly Bumped)

http://www.tf2outpost.com/trade/16413380

Sold at 1.33:

http://www.tf2outpost.com/trade/16402735

Many on backpack.tf classifieds and previously sold ones

http://backpack.tf/classifieds/search/id/5201c45f4bd7b8334a000000

http://www.trade.tf/deals/search/Sell/All/Flight%20of%20the%20Monarch/all/1

3 week old trade sold 5 monarchs at 1.55 (Outlier)

http://www.tf2outpost.com/trade/15839859

Could only find one sold at 1.66:

http://www.tf2outpost.com/trade/16411032