Posting this after my previous suggestion was closed and i was suggested to resubmit to flat price of 7.

http://backpack.tf/vote/id/51f490db4bd7b8a31c000009

*My old suggestion for quick reference

This is its first suggestion. High tier all class hat with good tier robo effect.

I sold mine for blizz muff stuff (8.2~9.5)

http://www.tf2outpost.com/trade/12431120

Other offeres were anti freeze tree (6.4 as per backpack.tf and was later sold for electrostatic ze goggle and outdoorsman and 2 buds). So basically sold for ~8 since the electrostatic are unpriced but their equivalent power surge are priced around 3 each. so 3+3+2=~8

http://www.tf2outpost.com/backpack/76561198087212786 check history of items till he got 2 buds from 'savages'.

This hat is unpriced high tier so people mostly don't go for it out of fear. But i successfully sold for old hat worth 8.2 to 9.5 so it is fair to price this one finally to 7.5 to 8.5