Caliber CH 28-520 IRM QA 24H
Self-winding Chronograph Caliber
Description
Self-winding Chronograph Caliber.
The new chronograph caliber CH 28-520 IRM QA 24H consists of 456 individual parts.
It is a mechanical movement featuring a column-wheel mechanism with a flyback function, power-reserve indicator, Annual Calendar, and a day/night indication.
It runs at a frequency of 28,800 semi-oscillations per hour (4 Hertz), assuring high rate accuracy and a very constant amplitude of the balance.
The winding power is delivered unidirectionally with a heavy 21K gold rotor.
As all mechanical movements manufactured by Patek Philippe, the new caliber displays the prestigious Geneva Seal, a privilege shared by only the most meticulously crafted movements.
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