Unissued & Unused - GENUINE BRITISH ARMY ISSUE:- PERSONAL RADIATION DOSIMETER WATCH TYPE LOCKET UNUSED and Sealed in the original foil packaging pouch. Standard issue to British military forces from the last decade of the Cold War (First issued in 1982), until the present day, these are genuine British Army issue personal dosimeters. Worn like a wrist watch, these locket style dosimeters were designed to measure the wearers exposure to radiation on an NBC battlefield by way of a photoluminiscent detector glass and PIN diode, the exposure level cannot be read direct from the dosimeter, instead a digital reading machine that reads the levels from a disassembled locket is required. The NSN is:6665-99-225-2314. An iconic piece of Cold War history, no Cold War/NBC collection should be without one of these!