Open Heart Mod Watches

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  • Nautilus (Open Heart, Chocolate) Seiko NH38 open-heart automatic mod watch. A brown dial watch with an open heart and a rose gold bracelet shown in a full product shot.
    Sale

    Nautilus (Open Heart, Chocolate) | NH38 Custom Mod Watch

    Seiko Nautilus Mod – Open Heart Chocolate
    $349.00 $524.00
  • Nautilus (Open Heart, Royal Blue) Seiko NH38 open-heart automatic mod watch. A blue dial watch with a silver bezel and a metal link bracelet shown in a full product shot.
    Sale

    Nautilus (Open Heart, Royal Blue) | NH38 Custom Mod Watch

    Seiko Nautilus Mod – Open Heart Royal Blue
    $349.00 $524.00
  • Nautilus (Open Heart Tiffany Blue) Seiko NH38 open-heart automatic mod watch. A turquoise dial watch with a octagonal bezel and a steel bracelet, shown in a full product shot.
    Sale

    Nautilus (Open Heart Tiffany Blue) | NH38 Custom Mod Watch

    Seiko Nautilus Mod – Open Heart Tiffany Blue
    $349.00 $524.00
  • Royal Oak (Rose Gold Skeleton) Seiko NH38 open-heart automatic mod watch. A black dial watch with a octagonal bezel and a steel bracelet, shown in a full product shot.
    Sale

    Royal Oak (Rose Gold Skeleton) | NH38 Custom Mod Watch

    Seiko Royal Oak Mod – Rose Gold Skeleton
    $349.00 $524.00
  • Nautilus (White Open Heart) Seiko NH38 open-heart automatic mod watch. A ice blue dial watch with a octagonal bezel and a steel bracelet, shown in a full product shot.
    Sale

    Nautilus (White Open Heart) | NH38 Custom Mod Watch

    Seiko Nautilus Mod – White Open Heart
    $349.00 $524.00
  • Nautilus (Black Open Heart) Seiko NH38 open-heart automatic mod watch. A black dial watch with a octagonal bezel and a steel bracelet, shown in a full product shot.
    Sale

    Nautilus (Black Open Heart) | NH38 Custom Mod Watch

    Seiko Nautilus Mod – Black Open Heart
    $349.00 $524.00

An open heart dial cuts an aperture into the face so you can watch the balance wheel beat. It is the clearest reminder that nothing inside is running on a battery, and it is the single feature people ask about most when they see one on a wrist.

What you are looking at through the window

The balance wheel oscillates six times a second, which is what produces the sweep of the seconds hand rather than a tick. On a closed dial you infer that. On an open heart you watch it. The aperture sits at the lower left of the dial, so it is visible without dominating the face or costing you legibility.

Two colourways

Chocolate and royal blue. Chocolate is the warmer and more unusual of the two and pairs well with brown leather and tan. Royal blue is the easier daily wear and reads closer to formal under a cuff.

Build

  • Genuine Seiko NH38, the open heart variant of the NH35 family, 41 hour power reserve.
  • Sapphire crystal.
  • 316L stainless steel case on an integrated bracelet, 39mm.
  • Splash-resistant as standard: everyday wear, not swimming or diving. A Swim-Ready upgrade can be added at order time.
  • 1 year warranty.

Ordering

Made to order and sized to your wrist, free worldwide shipping.

See how the integrated bracelet builds differ, or browse everything.