This must be one of the least in demand items in all of tf2. I went looking to see if the expected drop in prices had occurred. The first thing I noticed was that nothing was getting sold at 1.66.

http://www.tf2outpost.com/trade/6415038 - Unsold for 1.66

http://www.tf2outpost.com/trade/6941389 - Unsold for 1.66

http://www.tf2outpost.com/trade/6865159 - Unsold for 1.66

http://www.tf2outpost.com/trade/6711978 - Unsold for 1.66, offer of 1 ref

http://www.tf2outpost.com/trade/6857411 - Unsold for 1.66

http://www.tf2outpost.com/trade/6531737 - Unsold for 1.66

http://www.tf2outpost.com/trade/6686360 - Unsold for 1.66

http://www.tf2outpost.com/trade/6934717 - Unsold for 1.66

http://www.tf2outpost.com/trade/6856791 - Unsold for 1.66

At this point my thinking was: "1 - 1.33 sounds good..." I kept looking, and:

http://www.tf2outpost.com/trade/6884314 - Unsold for 1.33

http://www.tf2outpost.com/trade/6738630 - Unsold for 1.33, offer of 1 ref

http://www.tf2outpost.com/trade/6935432 - Unsold for 1.33

http://www.tf2outpost.com/trade/6949370 - Unsold for 1.33

http://www.tf2outpost.com/trade/6953276 - Unsold for 1.33

http://www.tf2outpost.com/trade/5498396 - Unsold for 1.33

These just aren't getting sold for anything above one ref. I can't put it any more bluntly than that. Even the trades at 1 ref are few and far between.

http://www.tf2outpost.com/trade/6110867 - Sold for 1 ref

http://www.tf2outpost.com/trade/6926563 - Selling for 1 ref

http://www.tf2outpost.com/trade/6830471 - Selling for 1 ref

Conclusion: These are extremely difficult to sell at 1.66 or 1.33 ref. the demand is practically non-existent. At the moment, the price appears to be 1 ref, but I would not be surprised if this has further to fall.

Let me know what you think :D