Last time, hopefully...

Only Sale (and only sale there's going to be until next year):

http://www.tf2outpost.com/trade/23443328#latest (traded for a Strange Cloud 9 Private Eye, 2-2.1 [2.05], no overpay [since bonzo billycock was offered])

Full 2-Person Item History: http://backpack.tf/item/3128882691

Yes, I have it in my inventory, and no, I'm not going to sell it. There's actually a bit of story behind this unusual (I originally traded for the same effect on a standard billycock but was asked to trade back), and it'll go nicely in my collection of two-person history annual Halloween unusuals.