Chronograph 5070

Launched at Basel in 1998: Patek’s first chronographChronographA watch function for starting, stopping and resetting an elapsed-time measurement independently of the ordinary time display.-only model since the 1463, and at 42 mm the largest chronographChronographA watch function for starting, stopping and resetting an elapsed-time measurement independently of the ordinary time display. it had made in series. Stepped bezelBezelThe frame surrounding the crystal at the front of a watch. and big tachymeterTachymeterA chronograph scale that converts the time taken to travel a known distance into average speed. The distance and scale units must correspond. and railway seconds track modelled on the ref. 2512; screw-down back, . The last Patek on the Lemania-based .