Miyota · 91 series
9122
A 4 Hz automatic providing day, date and month displays in a compact multifunction layout.
At a glance
- Type
- Automatic mechanical
- Display / complication
- Calendar
- Architecture
- Automatic calendar, three central time hands
- Timebase
- 28,800 vph / 4 Hz
- Power reserve
- Approx. 40 h
- Movement height
- 5.52 mm
- Jewels
- 26
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.
What distinguishes it
Look beyond the reference.
Compared with the 9100, the published function list omits the power-reserve and 24-hour indications. Both are 5.52 mm high and carry approximately 40 hours of running time.
For the enthusiast
The visual layout of a complete watch can make calendar hands resemble chronograph registers. Read the functions before interpreting the subdials: this movement displays calendar information rather than measuring elapsed intervals.