The APEX Full Black Open‑Heart delivers a stealth‑driven, modern, and mechanically expressive design. The deep matte‑black dial paired with a fully blacked‑out case creates a bold, monochrome aesthetic that feels refined, confident, and unmistakably APEX. The open‑heart window reveals the beating NH38 movement beneath, adding depth, motion, and character to an otherwise minimal, tactical‑inspired dial.

With a 41mm case size and a slim 12mm thickness, the Full Black Open‑Heart wears comfortably on any wrist. Bright C3 lume on the hands ensures visibility in low‑light conditions, while the screw‑down crown, solid case back, and 3 bar water resistance provide practical durability for everyday use.

Hand‑assembled with precision, the Full Black Open‑Heart feels solid, reliable, and ready for anything — a perfect blend of stealth styling and mechanical artistry.

Key Features

• 41mm case size — bold, modern proportions with strong wrist presence

• 12mm thickness — slim, comfortable, and ideal for daily wear

• Open‑heart dial — showcases the mechanical heartbeat of the NH38 movement

• C3 lume — bright, long‑lasting glow for maximum visibility

• Screw‑down crown — added security and improved moisture resistance

• Solid case back — clean, durable, and built for long‑term reliability

• 3 bar water resistance — protection from everyday splashes and light exposure

• Matte‑black dial + full black case — stealthy, modern, and versatile

• Reliable NH38 Seiko movement — open‑heart, no‑date, trusted accuracy, and easy servicing

• Hand‑assembled — each piece built with care and attention to detail

• Full black finish — bold, refined, and built to last

Who It’s For

The Full Black Open‑Heart is perfect for enthusiasts who want a watch that’s:

• Stealthy, modern, and expressive

• Minimalist with mechanical character

• Comfortable for everyday wear

• Highly legible in all conditions

• A confident, understated piece with a premium monochrome identity