... by a team of Chamonix mountain guides. It remains to date in extreme cold conditions. It will be left in the heart of the mountain as long as it continues to operate.

The P42I’s watertightness, as well as its assembly and calibration, make it the most versatile chronometric instrument in the PATTON range.

Our team of guides check that it is in good working order every time they pass near the site. The movement of this watch, extremely low in energy consumption,
is equipped with a lithium battery whose expected lifetime is ~10 years…