Patek Philippe caliber CH 28-520 IRM QA 24H

Patek Philippe caliber CH 28-520 IRM QA 24H
Brand:Patek Philippe
Reference:CH 28-520 IRM QA 24H
Movement:Automatic
Display:Analog
Diameter:33.00
Jewels:40
Reserve:55
Frequency:28800
Date:Annual Calendar, Date, Day, Month
Chronograph:Chronograph, Column wheel, Flyback
Hands:Day / Night Indication, Hours, Minutes
Additionals:Power Reserve Indicator

Description

The CH 28-520 IRM QA 24H was Patek's first in-house selfwinding chronograph movement.

Calibers based on the Patek Philippe CH 28-520 IRM QA 24H:

All watches using this caliber: