Seiko Instruments · Japan
Seiko NH36A
Seiko Instruments NH36A automatic movement with hacking, hand winding, day/date display, 24 jewels, 21,600 bph, and about 41 hours of power reserve. Islander uses NH36/NH36A in multiple automatic dive and field watches; some Islander models remove or hide the day/date mechanics for no-date dials.
Hz
Jewels
Reserve
In catalog
Technical specification
| Manufacturer | Seiko Instruments |
| Origin | Japan |
| Type | Automatic |
| Beat rate | 21,600 bph · 3 Hz |
| Jewels | 24 |
| Power reserve | 41 h |
| Hacking seconds | Yes |
| Hand-winding | Yes |
| Date | Yes |
| GMT | No |
| Chronograph | No |
3 models
Watches with this caliber
FAQ
Is the Seiko NH36A automatic or manual?
The Seiko NH36A is an automatic (self-winding) movement: a rotor winds the mainspring from the motion of your wrist, so it needs no battery. It can also be wound by hand via the crown.
What is the power reserve of the Seiko NH36A?
About 41 hours on a full wind — into a second day, so it keeps running overnight off the wrist. Power reserve is how long the Seiko NH36A keeps running once you stop wearing or winding it.
Does the Seiko NH36A hack (stop the seconds when you set it)?
Yes. Pulling the crown stops the seconds hand, so the Seiko NH36A can be set precisely to a reference time before you push the crown back in. Hacking is what lets you sync several watches — or a watch and a phone — to the exact second.
Does the Seiko NH36A have a date function?
Yes — the Seiko NH36A can drive a date display, though whether a given watch actually shows the date depends on the dial the maker chose, so check the individual model rather than the movement.
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