As the seconds ticked down for the contestants on early editions of Mastermind, Magnus Magnusson would be alerted by this hi-tech gizmo!
It would often be followed by his immortal phrase, "I've started, so I'll finish."
This device travelled around the country with the team in the 1970s - the show was broadcast from a different location each week - and is now part of the 91Èȱ¬ Heritage Collection.
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