Seiko Prospex Alpinist “Edo Purple” Limited Edition JDM HBC006J Automatic Watch (39.5 mm, Caliber 6R55 72h, AR-Coated Sapphire Crystal, Built-in Compass, 200 m WR, DiaShield)

Description and Key Features

The Seiko Prospex Alpinist HBC006J is a commemorative JDM Limited Edition (Japanese Domestic Market) piece that celebrates Seiko’s 145th anniversary by reinterpreting the legendary Alpinist line, first introduced in 1959. It stands out for its exclusive dial in Edo Purple (Edo Murasaki), a color historically linked to the distinction and tradition of Tokyo, combined with an internal rotating bezel featuring a functional compass operated via the sub-crown at the 4 o’clock position.

Inside beats the latest generation of Japanese watchmaking: the Seiko Caliber 6R55, which extends the power reserve to a full 72 hours (3 days) with manual winding and a seconds stop. Its classically proportioned case (39.5 mm in diameter and 12.7 mm thick) is crafted from solid stainless steel with a DiaShield (Diamond Shield) surface-hardening treatment, protecting the watch from micro-scratches caused by daily wear. It also features sapphire crystal with an anti-reflective coating, a screw-down crown for water resistance of 200 meters (20 bar), and a genuine black calfskin leather strap.

Technical Specifications

Feature Technical Detail
Brand / Collection Seiko Prospex Land – Alpinist
Reference HBC006J (JDM Limited Edition / 145th Anniversary)
Manufacturing Made in Japan (JDM – Japanese Domestic Market)
Movement Japanese-made mechanical automatic (hand-wound with seconds stop)
Caliber Seiko 6R55 (21,600 vibrations per hour, 24 jewels)
Power Reserve Approx. 72 hours (3 full days of power reserve)
Case Diameter 39.5 mm (without crown)
Case Thickness 12.7 mm
Case Material Solid stainless steel with DiaShield hardened coating (Super-hard coating)
Front Crystal Sapphire with anti-reflective coating on the inner surface
Dial Edo Purple (Edo Purple) with applied hour markers and faceted hands
Luminescence High-intensity LumiBrite on hour hands and outer hour markers
Bezel / Additional Feature Rotating inner ring with cardinal direction scale (compass) operated by the crown at 4 o’clock
Water Resistance 200 Meters / 20 Bar (screw-down crown)
Main Crown Screw-down at 3 o’clock
Case Back Screw-down case back with commemorative Limited Edition engraving
Magnetic Resistance Standard anti-magnetic shielding (4,800 A/m)
Strap: Genuine black cowhide leather
Closure: Three-fold deployant clasp with stainless steel safety pushers
Calendar: Date window at 3 o’clock

Key Selling Points

• JDM “Edo Purple” Limited Edition: Commemorative run initially reserved for the Japanese market. Its deep purple dial offers immediate collectible value compared to the standard green or black versions.
• 6R55 mechanical movement with 3-day power reserve (72h): Allows you to take off the watch on Friday and put it back on Monday morning without it having stopped or lost time.
• DiaShield Anti-Scratch Coating: Seiko’s patented thermal coating multiplies the surface hardness of the steel, resisting everyday abrasions from sleeves, zippers, or desks to keep the polish intact over the long term.
• Sapphire Crystal and 200 M True Water Resistance: Robust instrument watch construction. The screw-down crown and 20 Bar water resistance allow you to bathe, swim, or participate in water sports with complete peace of mind.
• Iconic 39.5 mm Ergonomics: The Alpinist’s benchmark size, balanced for any wrist and suitable for both the field/mountains and under a shirt cuff.
• Functional Solar Compass: The double crown allows you to align the inner bezel with the sun to mechanically determine north and bearing in the field.