In honour of the International Geophysical Year in 1958, Jaeger-LeCoultre created a watch protected against magnetic fields, water and shocks. The Geophysic chronometer was proposed by long-time employee Jules-César Savary as a watch intended for scientific bases in Antarctica. The watch was fitted with the Jaeger-LeCoultre Calibre 478BWS and featured seventeen jewels, a Breguet overcoil, a regulating spring on the balance-cock, a shock-absorber and a Glucydur balance. The year of its release, the Geophysic was offered to William R. Anderson, the captain of the Nautilus, the first American nuclear submarine to travel between the Pacific and Atlantic oceans via the North Pole.