The Seiko Mod "Nautilus" Emerald Open-Heart Edition is a captivating custom timepiece that unites a bold, sporty silhouette with a rich, luxurious color palette. The centerpiece of this build is its brilliant emerald green dial, featuring a classic horizontal embossed texture that creates a dynamic play of light and shadow. A signature open-heart aperture at the 9 o'clock position reveals the intricate mechanical heartbeat of the watch, allowing the wearer to observe the constant motion of the balance wheel. Housed in a meticulously finished 316L stainless steel case, the design pays homage to iconic maritime-inspired luxury watches with its distinctive "ears" and brushed octagonal bezel. The integrated H-link bracelet flows perfectly from the case, offering a cohesive and high-end aesthetic that feels solid yet comfortable on the wrist. Hand-assembled with a dependable Seiko automatic movement, this watch is a perfect choice for those who want a unique, statement-making accessory that balances modern style with traditional horological fascination.

Model Type	• Custom Seiko "Nautilus" Style Open-Heart Luxury Modification • Expertly hand-assembled featuring a vibrant emerald green and steel aesthetic • A unique artistic modification blending high-end sports DNA with mechanical transparency
Case & Material	• 316L Surgical-Grade Stainless Steel with premium brushed and polished surfaces • Features the iconic porthole-inspired case design with a decorative fixed bezel • Equipped with a reinforced solid case back and a textured crown for a secure grip
Case Diameter	• Versatile 40mm to 42mm case diameter for a balanced and commanding wrist presence • Slim, streamlined profile designed to sit elegantly and secure on the wrist • Ergonomic integrated lug design for a seamless transition from case to bracelet
Movement	• Reliable Seiko NH38 Automatic Caliber with hacking and hand-winding capabilities • Features a smooth sweeping mechanical seconds hand visible through the open dial • Provides a consistent power reserve of approx. 41 hours for dependable timekeeping
Crystal	• Ultra-hard, scratch-resistant synthetic Sapphire Crystal glass for maximum clarity • Engineered for long-term durability with superior resistance to daily scuffs and impacts • High-transparency finish to showcase the rich green dial and open-heart movement
Dial & Bezel	• Emerald green sunray dial featuring a horizontal embossed pattern and open-heart window • Polished silver-toned baton indices with luminous filling for low-light legibility • Signature brushed steel bezel with polished chamfered edges for a high-end glow
Strap & Clasp	• Premium 316L stainless steel integrated H-link bracelet with a brushed finish • Features a soft-touch texture and tapered design for an all-day comfortable fit • Equipped with a secure double-folding butterfly clasp for a clean, seamless finish
Water Resistance	• Rated for 3ATM to 5ATM (30m - 50m) depending on specific build gasket seals • Equipped with an internal gasket system to prevent moisture from daily splashes • Fully suitable for daily wear, hand washing, and formal social environments
Functions	• Central hours, minutes, and a central sweeping mechanical seconds hand • Open-heart balance wheel exhibition for real-time mechanical observation at 9 o'clock • Hacking seconds feature for precise time synchronization and professional adjustment