NH70 Automatic Movement Skeleton

The Seiko NH70 is a Japanese automatic skeleton movement designed to showcase the intricate mechanics of a mechanical watch. With its open-worked design, you can admire the movement in action while enjoying the same reliability and performance found in Seiko's trusted NH series. The NH70 features automatic and manual winding, as well as hacking seconds for precise time setting.

Specifications

  • Movement: Seiko NH70

  • Type: Automatic Skeleton

  • Origin: Japan

  • Jewels: 24

  • Power Reserve: Approximately 41 hours

  • Frequency: 21,600 vibrations per hour (3 Hz)

  • Functions:

    • Hours

    • Minutes

    • Seconds

  • Hand Winding: Yes

  • Hacking Seconds: Yes

  • Date Display: No

How to Use

Starting Your Watch

If your watch has stopped:

  1. Ensure the crown is fully pushed in.

  2. Turn the crown clockwise 20–30 times.

  3. The watch will begin running.

  4. Wear the watch regularly to keep it wound automatically.

A fully wound NH70 has a power reserve of approximately 41 hours.

Crown Positions

The NH70 has two crown positions.

Position 0 – Normal Position

The crown is fully pushed in against the case.

Function:

  • Manual winding

Turn the crown clockwise to wind the movement.

Position 1 – Time Setting

Pull the crown out until you feel one click.

Function:

  • Set the time

The seconds hand will stop, allowing you to set the time accurately.

How Do I Know Which Position I'm In?

Position 0

  • The crown is fully against the watch case.

  • You can wind the watch by turning the crown clockwise.

Position 1

  • Pull the crown out gently until you feel one click.

  • The crown will sit slightly away from the case.

  • This is the furthest position the crown can be pulled.

Since the NH70 has no date function, there is no second click or date-setting position.

Setting the Time

  1. Pull the crown to Position 1.

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

  3. Push the crown back in to resume normal operation.

Caring for a Skeleton Watch

The NH70's skeleton design exposes the beauty of the movement beneath the dial. While the movement is protected by the watch case and crystal, we recommend avoiding unnecessary impacts and keeping the watch clean to preserve its appearance.

Care Tips

  • Wind the watch before wearing it if it has stopped.

  • Keep the crown fully pushed in when not adjusting the time.

  • Avoid exposing the watch to strong magnetic fields.

  • Clean the case and crystal regularly with a soft microfiber cloth.

  • Service the movement approximately every 5–7 years for optimal performance.

Need Help?

Need assistance setting up your watch or have a question about your movement?

Our support team is here to help.

📧 support@monomods.com

Please include your order number and, if possible, a photo or short video of your watch so we can assist you as quickly as possible.