Patek Philippe Nautilus Chronograph 5980/1A-014 Gray Dial : Chronograph; 60-minute and 12-hour monocounter at 6 o'clock; Date in an aperture; Sweep seconds hand (chronograph hand); Gold applied hour markers with luminescent coating. Movement is hallmarked with the Geneva quality seal. Central rotor in 21K gold with unidirectional winding. The balance is a four-arm Gyromax with four inertia blocks. The Balance Spring is by Breguet.