A prisoner’s mining helmet from Star Trek VI: The Undiscovered Country. These were worn by the prisoners and this particular piece can be screen matched to one of the helmets in the equipment room on the Klingon penal colony of Rura Pente when Kirk and McCoy are wrongly sentenced to mine dilithium in shackles for the rest of their existence.
More from Star Trek VI: The Undiscovered Country (1991)