Seiko · 6R series
6R35
A three-hand date automatic extending running time to about 70 hours while retaining a 3 Hz balance.
At a glance
- Type
- Automatic mechanical
- Display / complication
- Date
- Architecture
- Automatic and manual winding, extended reserve
- Timebase
- 21,600 vph / 3 Hz
- Power reserve
- Approx. 70 h
- Jewels
- 24
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.
Its principal specification difference from the 4R35 is the much longer reserve. That is useful when rotating watches, provided the mainspring was fully wound before the watch was put aside.
For the enthusiast
The manual’s daily-rate range is a factory specification under stated conditions, not a guarantee for every position or state of wind. Compare the later 6R55’s 72-hour figure without treating two extra hours as a complete quality assessment.