Seiko 5 Sports SKX Dark Green HDB005J JDM Automatic Watch (42.5 mm, Caliber 4R36 Day/Date, Stainless Steel, 100 m WR, Made in Japan)

Description and Key Features

The Seiko 5 Sports HDB005J is a sporty, functional timepiece distributed exclusively in the JDM (Japanese Domestic Market) and manufactured entirely in Japan. A direct descendant of the legendary SKX series case with its iconic protected crown at the 4 o’clock position, this model stands out for its understated dial in a deep dark green (Dark Green) hue—a classic and highly sought-after color that combines everyday versatility with a distinctive aesthetic.

Inside beats the proven Seiko Caliber 4R36, an automatic mechanical movement featuring manual winding, a hacking seconds function, and a dual calendar with day-of-the-week and date displays. Its sturdy stainless steel case (42.5 mm in diameter and 14.2 mm thick) features a unidirectional 60-minute rotating bezel with excellent grip, hardened Hardlex mineral crystal, a screw-down caseback with a display window, and a water resistance rating of 100 meters (10 Bar), suitable for everyday use without worry, swimming, and water activities.

Technical Specifications

Feature Technical Detail
Brand / Collection Seiko 5 Sports – SKX Series
Reference HDB005J (JDM - Japanese Domestic Market)
Manufacturing Made in Japan
Movement Automatic mechanical movement with bidirectional winding (Magic Lever), manual winding, and seconds stop
Caliber Seiko 4R36, manufactured in Japan (21,600 vibrations/h, 24 jewels)
Power Reserve Approx. 41 hours
Case Diameter 42.5 mm (excluding crown)
Case Thickness 14.2 mm
Case Material Solid stainless steel with a satin-finished top and polished sides
Crystal Hardened Hardlex mineral crystal
Bezel Unidirectional rotating bezel with a 60-minute graduated scale
Crown Ergonomically positioned at 4 o’clock with integrated case protectors
Dial: Dark green (Dark Green) with raised circular and trapezoidal hour markers
Luminescence: High-intensity LumiBrite on hour hands, second hand, and hour markers
Water Resistance: 100 Meters / 10 Bar (suitable for swimming, showering, and regular water use)
Case Back: Screw-down with transparent display crystal (visible movement)
Magnetic Resistance: Standard anti-magnetic shielding (4,800 A/m)
Bracelet: Solid stainless steel, 3-link
Closure: Triple-fold deployant clasp with side-opening pushers and safety tab
Calendar Double window (day of the week and date) at the 3 o’clock position

Key Selling Points

• JDM (Made in Japan): Produced under the rigorous quality control standards for the Japanese domestic market, a distinction that adds resale value and demand compared to standard global models.
• Deep Dark Green Dial: An elegant and timeless shade that breaks away from classic black without sacrificing sophistication, offering a sharp contrast with the hour markers and great versatility with any outfit.
• 4R36 Mechanical Reliability: A movement known for its resilience to daily wear and tear, long-term durability, and ease of maintenance, with the added benefits of manual winding for instant power reserve and a seconds-stop function for precise second-by-second adjustment.
• Ergonomic Crown at 4 O’Clock: A classic SKX design that prevents the crown from digging into the back of the hand when flexing the wrist, significantly improving comfort during long days.
• LumiBrite Instant Visibility: Oversized markers and indices with a generous application of Seiko luminescent paste, ensuring instant readability in dark environments or underwater.
• 10 Bar (100 m) Water Resistance: A sturdy solid-steel case designed so you don’t have to take it off in the shower, pool, beach, or rain.