In 1958, Jaeger-LeCoultre took part in the extraordinary adventure of the International Geophysical Year by creating an outstandingly rugged model: protected against magnetic fields, shock- and water-resistant, as well as extremely accurate. Fitted with Jaeger-LeCoultre Calibre 478b, the Geophysic chronometer acquired tremendous prestige. When a group of Genevan citizens decided to honour the feats of the first atomic submarines to go under the North Pole, they presented the commanders of the Nautilus and the Skate with a gold Geophysic chronometer specially engraved for the occasion.
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