1 sale, this is rarely traded. Only 2 exist. No other recent traceable sales.

Offered (thus no overpay) on a Vivid Plasma Kabuto (4.2): http://www.tf2outpost.com/trade/23767542 (Proof the Brainiac is what the "added to discuss" comment meant: http://www.tf2outpost.com/trade/24034029 )

Brainiac history: http://backpack.tf/item/1241272267

Kabuto History: http://backpack.tf/item/905738217

Backpack Before: http://backpack.tf/profiles/76561198027902188?time=1417939200

Backpack After: http://backpack.tf/profiles/76561198027902188?time=1418025600

I there is anything wrong with this suggestion, please tell me and I will try to fix it. Thanks in advance and have a nice day :)