The Seiko Mod "Nautilus" Tiffany Open-Heart Edition is a stunning fusion of avant-garde sports luxury and intricate mechanical artistry. This custom timepiece centers around a vibrant "Tiffany Blue" dial with a classic horizontal embossed pattern, immediately drawing the eye with its bright, modern aesthetic. A standout feature is the "open-heart" window at the 9 o'clock position, which reveals the rhythmic beating of the internal balance wheel, offering a mesmerizing glimpse into the watch's soul. Encased in a brushed and polished 316L stainless steel case inspired by iconic porthole designs, it offers a bold yet slim profile that sits comfortably on the wrist. The integrated bracelet design flows seamlessly from the case, providing a unified, high-end look that is both sporty and sophisticated. Hand-assembled with precision, this modification is powered by a reliable Seiko automatic movement, ensuring that its beauty is matched by "workhorse" performance. It is an ideal choice for enthusiasts looking for a unique, high-impact accessory that celebrates both color and craftsmanship.

Model Type	• Custom Seiko "Nautilus" Style Open-Heart Luxury Modification • Expertly hand-assembled with a focus on contemporary "Tiffany" color palettes • An artistic blend of iconic integrated-bracelet design and mechanical transparency
Case & Material	• 316L Surgical-Grade Stainless Steel with alternating brushed and polished finishes • Features the signature "ears" and porthole-inspired octagonal bezel design • Equipped with a display or solid case back and a textured screw-down crown
Case Diameter	• Ergonomic 40mm to 42mm case diameter for a commanding yet wearable presence • Slim, streamlined profile designed to slide easily under a shirt cuff • Integrated lug design for a seamless transition from the watch head to the bracelet
Movement	• Reliable Seiko NH38 Automatic Caliber (Open-Heart) with hacking and hand-winding • No-date movement specifically chosen to maintain the clean aesthetic of the dial • Features a 41-hour power reserve with a sweeping mechanical seconds hand
Crystal	• Scratch-resistant Sapphire Crystal glass for crystal-clear dial and movement visibility • Treated with anti-reflective coating to reduce glare in bright lighting conditions • Engineered for high durability to resist daily scuffs, scratches, and impacts
Dial & Bezel	• Vibrant Tiffany Blue embossed dial with an open-heart window at 9 o'clock • Applied silver-toned baton indices with luminous filling for low-light legibility • Fixed brushed steel bezel with polished chamfered edges for a high-contrast glow
Strap & Clasp	• Premium 316L stainless steel integrated bracelet with H-link architecture • Features a smooth, tapered design that conforms comfortably to the wrist • Secured with a hidden double-folding butterfly clasp for a clean, continuous look
Water Resistance	• Rated for 3ATM to 5ATM (30m - 50m) depending on specific build gasket seals • Internal gasket system designed to protect against daily splashes and moisture • Recommended for daily wear and formal occasions rather than heavy water activities
Functions	• Central hours, minutes, and a central sweeping mechanical seconds hand • Visual balance wheel exhibition (Open-Heart) for real-time mechanical observation • Hacking seconds feature for precise time synchronization and adjustment