Seiko Prospex Green Dial Men 39.4mm HDB001K1

Rooted in mountaineering heritage and engineered for high-altitude exploration and everyday sophistication, the Seiko Prospex Land Alpinist 39.4mm HDB001K1 stands as one of the most revered adventure timepieces in modern horology. Forged in a surgical-grade 316L stainless steel case measuring 39.40 mm in diameter, 13.20 mm in thickness, and an ergonomic 46.40 mm lug-to-lug span, this model pairs satin-brushed lug tops with mirror-polished flanks and an iconic dual-crown configuration. The dial showcases a radiant sunray forest green finish with dynamic radial depth, framed by an internal bidirectional rotating compass ring operated by the secondary crown at 4 o'clock. Accented by vintage-inspired gold-toned cathedral hands, alternating Arabic numerals, luminous marker pips coated in high-intensity Seiko LumiBrite, and a magnified date window at 3 o'clock beneath an anti-reflective cyclops sapphire crystal, it is powered by Seiko's in-house Calibre 6R35 mechanical automatic movement. Delivering a weekend-proof 70-hour power reserve, hacking seconds, and manual-winding capability, it features a see-through exhibition case back and a rugged 200-metre (20 bar / 20 ATM) water resistance rating. Paired with a tailored 20 mm rich brown crocodile-embossed genuine leather strap secured by a three-fold push-button deployant clasp, it is protected by an official 3-year manufacturer warranty.

Key Highlights

• In-House Seiko Calibre 6R35 Automatic: High-performance 24-jewel Japanese mechanical movement featuring automatic bi-directional rotor winding, manual winding, and an extended 70-hour power reserve.

• Internal Bidirectional Rotating Compass Ring: Inner navigational bezel ring calibrated with cardinal points (N, E, S, W) operated via the dedicated crown at 4 o'clock to calculate direction using the sun.

• Iconic Sunray Forest Green Dial: Deep emerald and moss-green sunburst finish that shifts dynamically between vivid jade reflections and deep oceanic shadows.

• Vintage Gold-Toned Cathedral Hands: Classic poire squelette cathedral handset filled with generous Seiko LumiBrite for immediate low-light visibility.

• Anti-Reflective Sapphire Crystal with Date Magnifier: Scratch-resistant sapphire crystal equipped with an internal anti-reflective coating and a cyclops date magnifier at 3 o'clock.

• Ergonomic 39.40mm Case Architecture: Balanced vintage field-watch diameter engineered with a compact 46.40 mm lug-to-lug span to wear comfortably on diverse wrist sizes.

• Dual-Crown Engineering: Primary screw-down time-setting crown at 3 o'clock with protective shoulders, paired with a specialized directional crown at 4 o'clock.

• High-Intensity Seiko LumiBrite Phosphor: Non-radioactive luminous compound applied across hands, indices, and hour pips for long-lasting nighttime legibility.

• Exhibition Screw-Down Case Back: See-through display back showcasing the mechanical escapement, balance assembly, and decorated oscillating rotor.

• Substantial 200-Metre Water Resistance: Tested to 20 bar (200 m / 660 ft) with a screw-down crown and case back, making it fully capable of scuba diving, swimming, and marine sports.

• Tailored 20mm Leather Deployant Strap: Rich dark brown croc-embossed calfskin strap paired with a three-fold stainless steel clasp and push-button release.

• Official 3-Year Seiko Manufacturer Warranty: Fully covered across India and globally under Seiko’s comprehensive warranty network.

Design & Craftsmanship

The Alpinist Legacy & The 39.4mm Dual-Crown Silhouette

First introduced in 1959 for Japanese mountain climbers (Yama-otoko), the Seiko Alpinist was created to endure treacherous mountain terrain while maintaining refined aesthetic balance. Reference HDB001K1 carries this lineage forward within the Prospex Land series. Measuring 39.40 mm across with a moderate 13.20 mm height, the case is sculpted from hypoallergenic 316L stainless steel. The alternating finish—concentric circular brushing on the lug tops contrasted against mirror-polished case sides—accentuates the curves of the case. The presence of two crowns (the primary screw-down crown at 3 o'clock and the compass-adjusting crown at 4 o'clock) gives the watch its unmistakable, purposeful field aesthetic.