![]() Of course, this is not an easy thing to achieve. The result should be no more than -4 or +6 seconds of deviation per day. To measure the movement and precision of a watch, COSC places it at different temperatures and inspects it for days under varying conditions. In order for a watch to put the term Chronometer on its dial, it must pass the Official Swiss Chronometer Testing Institute, namely the COSC. 50 Hours > Frequency: 36000 (Hi-Beat) > Chronometer (COSC) Certified In the Swiss watch industry, the homeland of watchmaking, when you ask what a Chronometer watch is, the answer you will receive can be a title that diffucult to get. > Zenith Calibre 4039 SX In-house (Manufactured) Movement > Power Reserve: min. Titanium case that is as strong as steel and as light as a feather." > Limited Edition: 044 / 250 (Only 250 pieces were produced. ![]() It is manufactured to work perfectly under extreme conditions and very high pressure.
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