Destroyed Collar

The  is a slave collar that has detonated, and can be used as a necklace of sorts.

Locations
It is obtained when you start the Brotherhood of Steel story line but is removed after the first quest you do for them. It can also be found on a corpse labeled Man in a ruined building at Freeside's East Gate near Jacob Hoff and across from Mick and Ralph's, which is part of the I Could Make You Care quest line.

Appearances
The appears in Fallout: New Vegas.