SEIKO

This is a Seiko 5 Sports–style automatic watch, but important note: the exact dial layout strongly suggests this is a Seiko-mod or homage watch, not an official factory Seiko 5 Sports model.

Branding on Dial

• SEIKO

• 5 SPORTS

While it carries Seiko branding, the open-heart window + power-reserve subdial combination is not used on genuine Seiko 5 Sports models, which indicates a custom/mod or aftermarket build.

Key Features

• Movement: Automatic (self-winding)

• Open-heart display: Visible balance wheel at ~7 o’clock

• Power reserve indicator: Subdial at ~3 o’clock (0–40 scale)

• Dial color: Dark green sunburst

• Hands & markers: Luminous (dive-style indices)

• Bezel: Unidirectional dive-style bezel (60-minute markings)

• Case material: Stainless steel

• Crystal: Likely mineral or sapphire (mods often upgrade to sapphire)

• Strap

  • Type: Nylon canvas / NATO-style strap

  • Color: Olive green

  • Style: Military / field-watch aesthetic

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  Design Style

  • Diver-inspired case

  • Field/military color scheme

  • Mechanical showcase look (open heart)

  • Vintage-meets-modern aesthetic

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  Typical Specs (Approx.)

  (for Seiko mod / open-heart automatic builds)

  • Case size: ~40–42 mm

  • Thickness: ~12–13 mm

  • Lug width: 20 mm

  • Water resistance: Usually 50–100 m (depends on builder)

  • Movement type: Chinese or Japanese automatic (often Seagull or modified NH series)