An automatic watch is powered by the energy of the person who wears it. Wrist movement enables the mechanism to run. The Powermatic 80 movement boasts 80 hours of power reserve, which is enough to continue telling time accurately even if the watch is not worn for three days.
best men's watches with sapphire crystal -TISSOT T1274071106101 POWERMATIC 80 SILICIUM Men's Watch
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