Automatic Skeleton

A premium Japanese automatic skeleton movement designed to showcase the intricate mechanics of the watch. The NH70 features a fully skeletonized design with no date complication, making it a popular choice for open-worked and luxury-inspired timepieces.

The TMI NH70 is a premium automatic mechanical movement developed by TMI (Time Module Inc., part of the Seiko Group). Based on the trusted NH platform, the NH70 features a fully skeletonized architecture, allowing the movement to be admired from both the front and back of the watch. It combines reliability, manual winding, and hacking seconds with a striking open-worked appearance.

Specification

Details

Manufacturer

TMI (Seiko Group)

Caliber

NH70

Movement Type

Automatic with Manual Winding

Functions

Hours, Minutes, Seconds

Jewels

24 Jewels

Beat Rate

21,600 BPH (3 Hz)

Power Reserve

Approx. 41 Hours

Diameter

27.40 mm

Height

5.32 mm

Accuracy

-20 / +40 seconds per day

Hacking Seconds

Yes

Country of Origin

Japan or Malaysia


Operating Instructions

Automatic Winding

The NH70 automatically winds itself through the natural movement of your wrist while worn.

Manual Winding

If the watch has stopped:

  • Turn the crown clockwise approximately 55 times to fully wind the mainspring.

  • The watch will continue winding automatically while being worn.

Setting the Time

  1. Pull the crown to the second click.

  2. Turn the crown until the correct time is displayed.

  3. The second hand stops while setting the time for precise synchronization.

  4. Push the crown back to the normal position.

Note: The NH70 does not feature a date complication, so there is no date-setting position.

Care & Maintenance

  • Wear the watch regularly to keep the movement wound.

  • If not worn for several days, manually wind before use.

  • Avoid strong magnetic fields and severe impacts.

  • Keep the crown fully pushed in (or screwed down if applicable).

  • Professional servicing is recommended every 5–7 years, depending on usage and environmental conditions.

Why Choose the NH70?

  • Genuine Japanese automatic movement by TMI (Seiko Group)

  • Beautiful fully skeletonized design

  • Manual winding capability

  • Hacking seconds for precise time setting

  • Approximately 41-hour power reserve

  • Durable and reliable NH-series architecture

  • Perfect for skeleton and open-worked watches

The TMI NH70 is the ideal choice for enthusiasts who appreciate the artistry of mechanical watchmaking. Its skeletonized construction allows the inner workings of the movement to remain visible, combining proven reliability with a distinctive, eye-catching appearance.