Jaeger-LeCoultre thought that the features of the Geophysic made them the perfect replica watches for an expedition beneath the North Pole, since the watch was designed to withstand magnetic fields of up to 600 gauss and to keep up its precision in many circumstances. After three days in submersion, the Nautilus made the transit with succes. Jaeger-LeCoultre is still particularly proud to have contributed to this event by supplying the Geophysic replica watches.
As part of the International Geophysical Year program, on August 1st 1958, the first ever atomic submersible vessel Jaeger-LeCoultre replica watches, named USS Nautilus (in tribute to the fantastic submarine imagined by Jules Verne) set off to make a submerged transit from one ocean to the other via the most direct route – beneath the ice sheet covering the Arctic.
The most important design elements of the high quality replica watches were readability, precision and reliability. Its calibre 478BWSbr movement was derived from military replica watches and had a stop second function, a glucydur balance for stability through changes in temperature and was fitted with a shock absorber. A swan neck regulator was fitted for precise adjustment and an soft-iron inner case protected the movement from the negative effects of magnetism.