Proof 1: (current C/O)

http://www.tf2outpost.com/trade/14042173#p44325609

Got offered roboactive cold killer by GetLucky 3 days ago (denied)

Roboactive cold killer have 7 Pure offer by Archie #Music and is currently C/O at following link.

www.tf2outpost.com/trade/13603976#p43127354

Proof 2: (Offer)

http://www.tf2outpost.com/trade/14015987

Got offered harvest moon jeepcap(5.8–6.7 buds) by jojobirdie 1 week ago, the offer was denied since hat was duped(?). He also mentions miami gogles in his comment as 'AND/OR' that means he was willing to add it if seller wish to discuss. Check link below.

http://www.tf2outpost.com/trade/14015987#p43986664

Proof 3: (SOLD)

Sold for disco cosa nostra and a bud (sold to side)

http://backpack.tf/id/76561198054800238?time=1378537200 - http://backpack.tf/id/76561198054800238?time=1378450800

The difference is exact 1 bud and disco cosa nostra in exchange for disco HOC

This cosa nostra was sold for Cauldron bubbles Killer's Kabuto(5.1–5.4 buds) a pure earbud, a strange pan (8 keys) and some keys.

http://www.tf2outpost.com/trade/14236398

Proof 4: (Offer)

http://www.tf2outpost.com/trade/13522577#p43162002 (3weeks ago by tim tim)

smoking crones (4.1–5 buds)+ orb planet jefe (1.6–2.1 buds) - denied.

Proof 5: (SOLD)

Sold for blizz jefe (2.3 to 3 buds)+electrostatic conn cap (4.3 to 5.4)

http://backpack.tf/id/76561198044189366?time=1375772400 - http://backpack.tf/id/76561198044189366?time=1375686000

Considering all proofs the hat price range should be 6 to 7.