Patek Philippe 5960R - 40 Jewels Automatic. The CH 28-520 IRM QA 24H chronograph caliber is a self-winding mechanical movement with a flyback column-wheel chronograph, power-reserve indicator, Annual Calendar, and day/night display.
The Annual Calendar Chronograph is based on the venerable column-wheel principle for controlling the start/stop commands. However, it differs from clas- sic Patek Philippe column-wheel chronographs by virtue of a remarkable innovation: the clamps do not control the engagement of a lever-mounted clutch wheel with the chronograph train, but instead act on a disk clutch that transmits (chronograph running) or interrupts (chronograph stopped) the power between the fourth wheel and the chronograph hand.
This is a highly reliable solution that makes it possible to use the chronograph hand as a continuously running seconds hand without affecting the rate accuracy of the watch. For this reason, the subsidiary seconds dial customarily found in many chronographs is no longer needed on Patek Philippe’s Annual Calendar Chronographs.
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