The case-back is screw-locked to ensure the gasket is compressed in a regular manner that is also more reliable when subjected to strong pressures. The rugged cambered 3.60 mm thick sapphire crystal is able to withstand pressure equivalent to 890 kilograms, corresponding to the weight of a small car.
Jaeger-LeCoultre Calibre 979
Pulsometer, Master Compressor Diving Chronograph
Focus
Water-resistance to 1000 metres, Master Compressor Diving Chronograph
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