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Technical Details of this Military Chronograph. A lot of people ask us what are the benefits of sapphire crystal over a standard mineral crystal?. The reason that sapphire crystals are so strong is that after the sapphire glass is manufactured it is also heat-treated to remove its internal stresses—which can cause weakness—it is then made into the watch crystals and two layers of anti-reflective coating are applied, interestingly sapphire crystal is now used on the latest iPhone.
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