Audemars Piguet · 7138
7138
A modern perpetual-calendar automatic designed so its functions can be adjusted entirely through the crown.
At a glance
- Type
- Automatic mechanical
- Display / complication
- Perpetual calendar
- Architecture
- Thin automatic perpetual calendar with week, day, date, month, leap-year and astronomical moon indications
- Timebase
- 28,800 vph / 4 Hz
- Power reserve
- 55 h
- Movement height
- 4.10 mm
- Jewels
- 41
Reference sources reviewed 7 November 2026. Published specifications, not independent measurements. Versions and complete-watch specifications can differ; fields without a verified figure are omitted or identified.
Find it in a watch
Audemars Piguet Royal Oak Perpetual Calendar 26674ST.OO.1320ST.01
An example from the linked references. Check the exact model and production generation.
What distinguishes it
Look beyond the reference.
Its calendar programme handles month lengths and ordinary leap years. The distinctive advance is the crown-operated correction system, which removes the need for separate setting tools.
For the enthusiast
Introduced in 2025, 7138 brings a 4 Hz beat rate and 55-hour reserve to AP’s modern calendar range. It should not be confused with the older 5134 or its specifications.