Self-winding movement with column-wheel operated chronograph capable of measuring up to 1/100 of a second. The chronograph runs on its own escapement system, with a balance wheel operating at 360.000 bph. The power reserve for the chronograph is 50 minutes, and it is wound by hand. The balance for the regular timekeeping runs at 36.000 bph and is wound either by hand or through the oscilating weight. Both balance springs are made of 'carbon-matrix carbon nanotube composite'. The central hand makes one rotation every second; at 12:00 there's a power reserve indicator for the chronograph.
All watches using this caliber:
45.9001.9004/78.R581 Zenith Defy El Primero 21 White Gold / Diamond / Skeleton / Fabric / Swizz Beatz
95.9004.9004/78.R589 Zenith Defy El Primero 21 Titanium / Skeleton / Alligator / Vendôme Limited Edition
49.9001.9004/78.R915 Zenith Defy El Primero 21 Black Ceramic / Skeleton / Alligator / Boutique Edition
49.9001.9004/78.R916 Zenith Defy El Primero 21 Black Ceramic / Skeleton / Cordura / Boutique Edition