Glitched Circuit Board
A cosmetic item added in the November 22, 2013 Patch. It was used to replace all robot gate hats that were accidentally made craftable on the November 21, 2013 Patch. Like the Barely-Melted Capacitor, this item doesn't change the appearance of any of the classes when equipped.
There are 109 known instances of this item.
Source
Glitched Circuit Board
Team Fortress 2 Limited Level 55 Circuit Board
The remains of a Robo GateBot Light. It self-destructed after falling into the hands of a human.