NAUT MOD - BLACK (OPEN HEART)

The Naut Mod Black Open Heart pairs the all-black intensity of the Blacked Out variant with a dial cutout that frames the NH38 automatic movement in motion. On a dark dial the open heart window creates a striking depth — the spinning rotor visible against the black surface, mechanical and graphic at once. It is an integrated-bracelet sports watch Seiko Mod for the enthusiast who wants to see their movement working, without giving up the coherent monochrome look. Every piece is hand-assembled by MedoMods in Germany and ships EU-wide without customs complications.

Key Specifications

• 41 mm stainless steel case – versatile size, works on most wrist sizes

• Automatic Seiko NH38 movement – self-winding, hacking seconds, hand-windable; movement visible through the open-heart aperture

• Sapphire crystal with Super-LumiNova – scratch-resistant glass; luminous hands remain readable in low light

• Screw-down crown & 5 ATM water resistance – sealed and protected for everyday conditions

• Adjustable integrated stainless steel bracelet with butterfly safety folding clasp – flush fit between case and bracelet, secure butterfly clasp

• Case back: exhibition window or solid steel – exhibition gives you a second view of the NH38 from the back; solid keeps it clean

Two Windows Into the Movement

Choose the exhibition case back and you get the full experience: the NH38 rotor visible from the front through the open heart, and from the back through the sapphire case back window. The black dial makes the cutout stand out more sharply than on lighter dials — the contrast between the dark surface and the moving parts beneath is immediate and honest. This is a Seiko Mod that rewards people who understand what they are looking at, built with the attention to detail that only hand-assembly can deliver. Shipped from Germany, ready to wear the day it arrives.