This is a Nuclear Device Activation Key from James Cameron's 1994 blockbuster "True Lies" starring Arnold Schwarzenegger. Secret agent Harry Tasker (Arnold Schwarzenegger) is a busy man; when he's not saving the world from terrorists, he's under cover as a boring computer salesman, juggling the everyday needs of his wife, Helen (Jamie Lee Curtis), and his daughter. While Harry and his partner, Gib (Tom Arnold), work to stop a gang of international terrorists from getting their hands on missing nuclear weapons, Helen, feeling neglected, begins a covert affair with a sleazy used car salesman pretending to be a spy.

A key like this is used by terrorist leader Salim Abu Aziz (Art Malik), to activate and detonate a nuclear device in a remote Florida Key island and deliver menace to blow a second one in downtown Miami right after. Key is constructed of tooled aluminum cylinder, which has been grooved and notched with key teeth. The cylinder is imbedded in cast resin fob, which hang from 16 in. steel ball chain.

It measures approx. 4 x 2inch and shows wear from production usage.