Seiko NH38: the ideal automatic movement for Open Heart watches

The Seiko NH38 is a highly regarded automatic movement in independent watchmaking, particularly for Open Heart watches. This type of watch reveals part of the mechanism directly on the dial, allowing the wearer to observe the movement in operation.

Thanks to its reliability and robust design, the NH38 provides an excellent base for open-design automatic watches.

What is an Open Heart watch?

An Open Heart watch features an opening in the dial that reveals the balance wheel of the mechanical movement. This opening offers a glimpse into the watch's inner workings and showcases the watchmaking mechanics.

This type of design is particularly appreciated by watch enthusiasts, as it allows you to see the watch come to life and work on the wrist.

The features of the Seiko NH38

The NH38 is based on the reliable architecture of Seiko automatic movements. It features automatic winding via wrist movements, as well as manual winding and a stop-seconds function for precise time setting.

Its power reserve is approximately 41 hours , allowing the watch to continue running even when not worn for a day.

A perfect movement for personalized watches

The NH38 is particularly appreciated in the world of personalized watches , as it allows for the design of open dials that showcase the mechanical movement.

This configuration is often used in Open Heart watches, which offer a unique aesthetic by revealing part of the mechanism.

The NH38 at CG Custom Watches

At CG Custom Watches , we select authentic Seiko movements renowned for their robustness and precision.

Combined with our configurator, the NH38 allows you to create a personalized automatic watch , hand-assembled in our workshop in Switzerland.