7 months old price.

http://www.tf2outpost.com/trade/11966500 - duped

Sold for Misty Skull Swagman's Swatter (10.6–12.5 buds)

http://www.tf2outpost.com/trade/13580544 (duped)

Offers

* Moon Merryweather (8.5–8.9 buds) + 1.5-2 buds = 10-10.9 buds

* Duped Moon Fez (9.8–11.3 buds for non-duped) + Logo Pencil (13–16 keys - old price) or + Steaming Grimme (21–22 keys) = ~9.7-12.2 buds

http://www.tf2outpost.com/trade/12991949

Seems to be clean

Offers

* misty skull attendant (5.2–5.8 buds) + blizzard YWN (1.4–1.7 buds - 7 months old) = 6.6-7.5 buds

* Wraith wrap knifestorm (8.4–9.3 buds)

http://www.tf2outpost.com/trade/12365141

Sold Attendant + P. Fetti TC (5.8–6.3 buds) for Secret Stahl (18.2–20 buds)

Making the Attendant 12.4–13.7 buds

http://www.tf2outpost.com/trade/10686080

Sold for Burning Cowl (9.6–10.3 buds)

I know these contain duped hats. Yet these are getting higher offers/sales than the clean one. Clean one hasn't been sold for a long time.

Burning Cowl is an outlier. Rejected offers are higher.