Destroyed Collar

The destroyed collar is a slave collar that has detonated, and can be used as a necklace of sorts that appears that the wearer attempted (and failed) to take it off, judging by the decapitated head and the nearby wrench.

Characteristics
The collar, when worn, has 0 DT, and no in-game effect except for being visible as a bulky metallic collar with no visible differences to a functional collar.

Locations

 * It is obtained when one starts the Brotherhood of Steel questline but is removed after the first quest.
 * It can also be found on a corpse labeled "Man" in the westernmost corner of a ruined building at Freeside's east gate near Jacob Hoff and across from Mick & Ralph's.