Royal Oak Perpetual Calendar
A steel Royal Oak perpetual calendar with a tone-on-tone blue dial.
This was the first Royal Oak to use calibre 7138, Audemars Piguet’s new self-winding perpetual calendar.
Every function is set with the crown alone, and no tool is needed. Three patented mechanisms make that possible.
The dial is blue, with matching subdials and a blue inner bezel. The case is 41 mm across and 9.5 mm thick.
- Reference
- 26674ST.OO.1320ST.01
- Introduced
- 1972 (Royal Oak)
- Case
- 41 mm, 9.5 mm thick, steel
- Movement
- Calibre 7138, self-winding
- Power reserve
- About 55 hours
- Water resistance
- 50 m
- Functions
- Perpetual calendar: week, day, date, astronomical moon, month, leap year; hours, minutes
- Notable
- Perpetual calendar set with the crown only
