 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.