5 sales at 2 ref and 1 sale at 1.88ref: http://imgur.com/Bl5imkr

Classifieds: http://imgur.com/ljRiEnV

Only 1 seller at 1.66, last online 2 days ago. (this joker dude has many classifieds under bp.tf price but is never online to accept: http://imgur.com/750tnfS )

Outpost, selling under 1.66 ref:

none

Outpost, selling 1.66:

http://www.tf2outpost.com/trade/27499198 -> 2 days

http://www.tf2outpost.com/trade/27501548 -> 2 days

http://www.tf2outpost.com/trade/27515620 -> less than 1 day

http://www.tf2outpost.com/trade/27442450

http://www.tf2outpost.com/trade/27512392 -> no trade offer link

Outpost, selling 2 ref:

http://www.tf2outpost.com/trade/27452297

http://www.tf2outpost.com/trade/27509841 -> 1 day

http://www.tf2outpost.com/trade/27490296 -> poorly bumped

Outpost, sold for 2 ref:

http://www.tf2outpost.com/trade/27430251 -> restocker, original listed item no longer in inv. others are.

Outpost, sold for 1.66 ref:

http://www.tf2outpost.com/trade/27487998 -> no longer in inv.

http://www.tf2outpost.com/trade/27471852 -> no longer in inv.

With this much proof I'm ignoring classifieds on outpost unbumped for more than a day.

Conclusion:

sufficient proof for 1.66-2 ref range: Many sold at 2 ref recently also still sellers at 1.66 ref right now.