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Close 100m/330ft Case Back Transparent Band Material Stainless Steel Color/Finish Brushed & Polished Clasp Folding Clasp With Safety Latch Lug Width 20mm Movement Automatic An automatic/self-winding movement is powered by a thin spiral torsion spring, called the mainspring, which is housed in an enclosed barrel inside the movement. The energy produced from the wound spring drives the movement functions. An automatic watch has a weighted rotor mounted on a pivot to the back of the movement, and the rotor is connect to the mainspring through a series of gears. The natural motion of the wearers wrist will cause the rotor to spin, which in turn will automatically wind the mainspring. Please note: An automatic winding watch which has completely wound-down or is at the end of its power reserve requires manual winding. Manually winding an automatic watch ensures that the watch is at full power-reserve when first worn, and as long as the watch is in motion thereafter it will remain fully wound, ensuring that when the watch is removed it will run the specificed power-reserve duration. Close Complications Chronograph

• Brushed & polished stainless steel case.
• Black polished ceramic bezel with 1/10th of a seconds seconds track.
• Blacklacquered dial.
• Tri-colored sub-dials.
• Polished hands, the hour & minute hands with luminous fill.
• Applied faceted polished index hour markers with luminous tips.
• Running small seconds sub-dial at 9 o’clock.
• Date window at 4.30.
• Chronograph/stopwatch functions:
• Column-wheel mechanism.
• Measures up to 1/10th of a second.
• Large central 1/10th of a second counter hand, makes a complete revolution every 10 seconds.
• 60 seconds counter sub-dial at 3 o’clock.
• 60 minutes counter sub-dial at 6 o’clock.
• Zenith caliber El Primero 3600 features: stop-seconds, beats at 36,600 vph (5Hz), contains 35 jewels & has a power reserve of approximately 60 hours.

Mens Zenith 03.3100.3600/21.m3100 Chronomaster Sport 41mm Watch