I love it when I find an easy suggestion. Don't you?

Unsolds at 7 refined

http://www.tf2outpost.com/trade/26362421 - Not bumped in past few days

Sellers at 6.66 refined

http://www.tf2outpost.com/trade/26390744 - young

That is literally the only trades with no paint on outpost...

Supporting evidence - Classifieds

http://imgur.com/NO7EzSO

Sellers

2 x 6 refined

2 x 6.66 refined

1 x 6.94 refined

2 x 7 refined

Buyer

1 x 4.66 refined

Unfortunately, I don't have enough evidence for 6 refined, so I will have to stay conservative and go with a range of 6.66 - 7 refined.

Constructive Criticism and Counter Proof along with Helpful Feedback is Appreciated :)

In case you are wondering, I've included 7 refined in the range because the only unsold at 7 refined in poorly bumped so I have to be conservative.