Junghans 'Mega 1' digital quartz wristwatch, 1990.
© Science Museum / Science & Society Picture Library
This watch is synchronised by the long-wave radio time signal transmitted from Frankfurt, Germany, originating from the atomic clocks at the German National Standards Laboratory. The 'Mega 1' was the world's first radio-controlled wristwatch. The radio antenna is in the watch strap, and the watch can receive the time signal acros most of Europe. The case was designed by Frogdesign.