Portugieser Series Automatic Machinery Chronograph Men Watch is equipped with SWISS ETA 7750 automatic timing machine movement that Daily Error about 10 seconds. 6:00 position is small second hand, big second hand timing is controled by the top button, press the big second hand one time to start walking time, walk a circle, 12:00 position small circle walk a grid, representing a minute of timing. The IWC Portugieser Chronograph IW371447 ZF Factory Black Dial Replica Watch adopts 316L polished steel case that exquisite polishing, anti-wear and anti-scratch. And use anti-scratch sapphire crystal glass watch mirror, black calfskin leather strap, dense bottom design and daily life waterproof.