last true price was 9 months ago

http://www.tf2outpost.com/trade/11169350 - offered bubbling mullet

white bills + dashin + dirty high 5 = 9.5 + 2 + 1 = 12.5 rejected

http://www.tf2outpost.com/trade/11444547 - sold for 15 keys

http://www.tf2outpost.com/trade/11112315 - only wanted 13, had 12 key c/o

http://www.tf2outpost.com/trade/11212989 - rejected 11, had offer of white bills + 4 keys = 13.5

i dont think this is in effect anymore, but any unusual can get 12 keys after looking for a while

13-15 seems fair based on the proof

13 based on offers and 15 based on highest sale