The NH35 in a Seiko Mod
The NH35A is an automatic movement with three hands and a date display. Time Module (TMI) documents manual winding, stop-second, 21,600 vibrations per hour, 24 jewels and more than 41 hours of running time. Whether it fits a specific build also depends on the dial, case and other components.
The technical data
According to Time Module (TMI), the NH35A has these specifications:
- Frequency: 21,600 vibrations per hour, equivalent to 3 Hz
- Running time: more than 41 hours
- Jewels: 24
- Manual winding and stop-second: yes
- Calendar: date
- Outside diameter: 27.4 mm
- Casing diameter with dial holding spacer: 29.36 mm
- Height: 5.32 mm
- Factory accuracy: -20 to +40 seconds per day under TMI's stated test conditions
These are manufacturer specifications, not measurements from a specific finished watch. Our sourced NH35 vs NH36 comparison contains the full table and a CSV file.
NH35A or NH36A?
The clear functional difference is the calendar display: the NH35A shows the date, while the NH36A shows day and date. TMI lists the same main external dimensions for both. That does not automatically mean every dial, case or hand set is interchangeable, so always check the specifications of the exact component.
Which movement is inside a MedoMods watch?
Use the movement specification on the relevant product page or configuration. The visible dial alone is not reliable proof of the movement fitted. If a specification is missing or appears inconsistent, we will clarify it for the exact model before purchase.
Keep reading & matching models
Frequently asked questions
Who publishes the NH35A technical specifications?
Time Module (TMI) lists the NH35A in its mechanical NH product line and publishes specification sheets and a technical guide. The data on this page is based on those primary sources.
How accurate is an NH35?
TMI specifies -20 to +40 seconds per day under defined test conditions. The rate of a finished watch also depends on position, winding state and use. We do not promise a tighter value without a documented measurement of the specific watch.
Can I hand-wind the NH35 and stop the seconds?
Yes, the NH35 offers both: hand-winding and hacking (the seconds hand stops when you set the time), so you can set the watch to the exact second.
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