A rare Jaeger-LeCoultre Geophysic chronometer stainless steel circular cased gentleman's wristwatch, circa 1958, the signed and jewelled P478/BWSbr caliber manual wind movement numbered '1331729', with dust cover, the signed white dial with silvered Arabic '12' and '6' and baton hour markers, the signed case back interior numbered '748239', case diameter 3.5cm, on a black leather strap. Note: the Geophysic was produced for only one year in 1958 to celebrate Jaeger-LeCoultre's 125th anniversary and also the world's first International Geophysical Year. The Geophysic was produced to withstand extreme conditions and meet the highest standards, particularly in terms of water resistance, anti-magnetism and precision timing. It subsequently became a symbol of excellence for the watchmakers.