Seiko NH34 GMT automatic movement
Everything you need to know about the essential GMT caliber
The complication GMT (Greenwich Mean Time) is one of the most sought-after watch functions for travelers and enthusiasts of fine mechanics. Allowing the simultaneous tracking of the time in two separate time zones, it has become widely accessible thanks to a Japanese caliber renowned for its precision and durability: the automatic movement Seiko NH34 (produced by TMI, a subsidiary of Seiko Instruments Inc.).
At the heart of our brand new
What is the Seiko NH34 caliber?
Derived from the famous NH35 and NH36 calibers, the NH34A is a self-winding mechanical movement specially designed to accommodate a fourth central hand dedicated to the 24-hour cycle.
- Origin : Japan (TMI/Seiko Group)
- Type of movement : Self-winding mechanical
- Complications : Hour, Minute, Second, Date, GMT (24h) hand
- Frequency : 21,600 alt/h (3 Hz)
- Power reserve: ~41 hours
- Number of rubies : 24 rubies
- Luminescence : Super-LumiNova® (Swiss RC Tritec)
- Functions : Stop-seconds and manual winding
How does the "Office GMT" complication work?
The NH34 caliber adopts an architecture known as Office GMT (or Caller GMT). This system prioritizes the direct and independent adjustment of the 24-hour hand without stopping the watch's movement.
- To quickly adjust the date in a direction of rotation.
- To advance the GMT hand hour by hour in the opposite direction.
This is the ideal setup for keeping an eye on a distant time zone, planning an international call or tracking the time of a loved one abroad with a simple glance at the 24-hour rehaut.
The news Concordia GMT: the tool watch reinvented
To accommodate this caliber, we completely redesigned the architecture of our iconic model.
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Water resistance 30 ATM (300 m): A
Case robust 316L steel 40.5 mm (11.75 mm thick excluding glass) with a screwed crown. - Double-domed sapphire crystal: Anti-reflective coating for a unique visual relief, complemented on the back by a transparent sapphire case back allowing the mechanics to be admired.
- Optimal readability: New raised indexes, dedicated minute track and Swiss Super-LumiNova® luminescent treatment (RC Tritec).
5 colors inspired by wide open spaces
The collection is structured around five shades designed for every temperament:
- Antarctic Blue: A tribute to the origins of the model, originally designed for Matthieu Tordeur's polar expedition to Antarctica (1,150 km at -37 °C).
- Black : The timeless, technical elegance of the benchmark tool watch.
- Tundra: A luminous white dial evoking frosty landscapes.
- Bordeaux: A strong and warm temperament.
- Sage: A subtle and contemporary vegetal shade.
All versions benefit from our system for changing
There
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Through "Follow the line," Charlie Paris invites calligrapher Gina Serret to explore the beauty of gesture and lived time, enhanced by our watch. Initial 36 Day/Night.
To learn more about GMT watches, you first need to better understand what time zones are.
