The jumping second - Seconde morte - True second
An unusual detail of the mechanical movement is the jumping second hand. A complex technology ensures that the second hand jumps to every full second without interrupting the function of the watch. Watches with a mechanical movement normally have a "creeping second". The hand moves continuously in small intermediate steps several times per second.
The Watchmaker of Watchmakers
Jaeger-LeCoultre is a Swiss watch brand based in the Vallée de Joux. The valley is considered the epicentre of Swiss watchmaking. Since 1833, watches of the highest mechanical precision have been designed and manufactured here. Jaeger-LeCoultre is known as the "Watchmaker of Watchmakers". The Geophysic model by Jaeger-LeCoultre was designed in 1958 as part of the International Geophysical Year. It was designed for research trips and expeditions.