Seiko Prospex Alpinist GMT HBC009J JDM Automatic Cal. 6R54 72-hour Power Reserve Sapphire Crystal 200m Made in Japan 39.5mm

Seiko Prospex Alpinist Mechanical GMT HBC009J JDM Cal. 6R54 3-Day Automatic Black Dial Leather Strap 200m Made in Japan 39.5mm

• Exclusive JDM edition for the Japanese domestic market, manufactured entirely in Japan (Made in Japan).
• Seiko-manufactured Calibre 6R54 automatic movement with GMT complication (independently adjustable 24-hour hand), manual winding, seconds stop and an extended 72-hour (3-day) power reserve.
• Bidirectional rotating inner ring with a solar-powered compass operated via a dedicated crown at 4 o’clock, and a fixed outer bezel in brushed steel with a 24-hour scale.
• 39.5 mm stainless steel case protected by a super-hardened DiaShield coating against scratches and a domed sapphire crystal with internal anti-reflective coating.
• Highly legible black dial with applied wedge-shaped hour markers, Arabic numerals, a red-tipped GMT hand and LumiBrite luminescent coating on the hands and hour markers.
• Water resistance of 20 bar (200 metres) with a screw-down main crown, screw-down display caseback, magnetic resistance and a black calfskin strap with a push-button folding clasp.

The Seiko Prospex Alpinist Mechanical GMT HBC009J (new Japanese reference for model SBEJ005 / SPB379) elevates the historic Japanese mountaineering watch from 1959 by incorporating a dual-time zone GMT function and a power reserve of three full days. Its matt black dial combines three-dimensional applied hour markers with a red-tipped 24-hour hand that indicates the second time zone on the fixed brushed steel bezel, whilst its iconic rotating inner bezel allows for orientation in open terrain when used in conjunction with the 24-hour hand as a sun compass.

Powered by Seiko’s in-house 6R54 automatic calibre with 24 jewels and a 72-hour power reserve, it offers a robust design ready for real expeditions and everyday use. The 39.5 mm case features a DiaShield hardened surface treatment that protects the finish against scratches, a screw-down crown and water resistance to 200 metres (20 ATM), complemented by a curved, anti-reflective sapphire crystal and a black calfskin strap with a safety folding clasp.

Brand: Seiko
Collection: Prospex (Alpinist Mechanical GMT)
Reference: HBC009J (SBEJ005)
Origin / Market: Made in Japan · JDM (Japanese Domestic Market)
Movement: Manual-winding mechanical (Calibre 6R54)
Power reserve: Approximately 72 hours (3 days)
Jewels / Frequency: 24 jewels · 21,600 vibrations per hour
Functions: GMT (separate 24-hour hand), seconds stop, date, compass ring
Dial: Black with applied hour markers and LumiBrite on hands and hour markers
Crystal: Curved sapphire crystal with anti-reflective coating on the inner surface
Case material: Stainless steel with DiaShield hardened coating
Crown and case back: Screw-down main crown (compass crown at 4 o’clock) and screw-down display case back
Case diameter: 39.5 mm
Thickness: 13.6 mm
Strap: Black calfskin leather with a folding clasp featuring a push-button release
Water resistance: 20 bar / 200 metres
Additional protection: Magnetic resistance (4,800 A/m)
Calendar: Date window between 4.00 and 5.00