Seiko 5 Sports SKX “Edo Murasaki” Automatic Watch, 145th Anniversary Limited Edition HDB003J JDM (42.5 mm, Caliber 4R36 Day/Date, Stainless Steel, 100 m WR)

Description and Key Features

The Seiko 5 Sports HDB003J is a commemorative JDM (Japanese Domestic Market) Limited Edition piece manufactured entirely in Japan to mark the 145th anniversary of Seiko’s founding. A direct descendant of the legendary SKX series’ instrumental case—with its recognizable crown offset at 4 o’clock and protected by integrated guards—this model features an exclusive dial in Edo Purple (Edo Murasaki), a color historically reserved for the Japanese nobility and which pays homage to Tokyo’s cultural roots.

Inside, it is powered by the proven Seiko Caliber 4R36, an automatic mechanical movement equipped with manual winding, a hacking seconds function, and a dual calendar displaying the day of the week and the date. Its robust case, 42.5 mm in diameter and 13.9 mm thick, is forged from solid stainless steel, paired with a steel link bracelet, an easy-to-grip unidirectional rotating bezel, hardened Hardlex mineral crystal, and a water resistance rating of 100 meters (10 Bar), making it suitable for continuous daily use, swimming, and water activities without risk.

Technical Specifications

Feature Technical Detail
Brand / Collection Seiko 5 Sports – SKX Series
Reference HDB003J (145th Anniversary Limited Edition / JDM)
Manufacturing Made in Japan (Japanese Domestic Market)
Movement Automatic mechanical 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 (without crown)
Case Thickness 13.9 mm
Case Material Solid stainless steel with a brushed finish and polished edges
Front Crystal Hardened Hardlex mineral crystal
Bezel Unidirectional rotating bezel with a 60-minute graduated scale
Crown Ergonomically positioned at 4 o’clock with an integrated case protector
Dial: “Edo Murasaki” purple with raised circular and trapezoidal applied hour markers
Luminescence: High-luminance 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 window and Limited Edition markings
Magnetic Resistance Standard anti-magnetic shielding (4,800 A/m)
Bracelet Solid stainless steel, 3-link
Clasp Triple-fold deployant clasp with side-opening pushers and safety lock
Calendar Dual window (day of the week and date) at the 3 o’clock position

Key Selling Points

• Commemorative JDM Limited Edition: Exclusive model for the Japanese domestic market celebrating Seiko’s 145th anniversary; adds immediate collectible value and scarcity in the European and international markets.
• “Edo Murasaki” Dial Color: Offers a distinctive aesthetic compared to the usual black or blue variants, maintaining visual elegance without sacrificing the sporty character of the SKX series.
• 4R36 Mechanical Reliability: A movement proven for its resistance to daily wear, long-term durability, and ease of technical maintenance, with the added convenience of manual winding and a seconds-stop function for precise adjustment.
• Crown Ergonomics at 4 O’Clock: The classic SKX design prevents the crown from digging into the back of the hand when the wrist is flexed, ensuring comfort during extended periods of wear.
• LumiBrite Night Visibility: Generous application of Seiko’s proprietary luminescent compound at all key time-reading points, ensuring instant readability in the dark.
• Solid Steel Construction and 10 Bar Water Resistance: An everyday workhorse watch: withstands accidental impacts, seawater, pool water, and rain without compromising the internal mechanics.