Patek Philippe caliber CH 28-520 IRM QA 24H
Patek Philippe · Movement

Patek Philippe caliber CH 28-520 IRM QA 24H

Ref. CH 28-520 IRM QA 24H

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

Type
Automatic
Display
Analog
Power reserve
55 h
Frequency
28800 vph
Jewels
40
Diameter
33 mm
Complications
Annual Calendar, Chronograph, Column wheel, Date, Day, Day, Flyback, Hours, Minutes, Month, Night Indication, Power Reserve Indicator

Variants

1
CH 28-520 QA 24H

Used in

17 models