Longines Spirit Zulu Time Sunray Blue Dial Men 39mm L38024936

Celebrating a century of pioneering aviation dual-time instruments and the iconic 1925 Zulu Time pocket watch, the Longines Spirit Zulu Time 39mm L38024936 unites authentic pilot heritage with contemporary ergonomics and maritime blue brilliance. Forged in a versatile 39.00 mm surgical-grade 316L stainless steel case measuring 13.50 mm in thickness with a compact 46.80 mm lug-to-lug span, this model pairs satin-brushed surfaces with mirror-polished bevels and a scratch-proof high-tech blue ceramic bidirectional rotating 24-hour bezel. The dial showcases a radiant sunray cobalt-blue finish with dynamic radial depth, framed by applied silvered Arabic numerals and five applied stars—the historic hallmark of Longines' highest-grade movements—accompanied by an arrow-tipped 24-hour GMT hand and a date window at 6 o'clock beneath a domed anti-reflective sapphire crystal. Powered by the exclusive in-house Calibre L844.4 mechanical automatic movement certified as an official Swiss Chronometer by the COSC (Contrôle Officiel Suisse des Chronomètres), it features true "flyer" independent local hour adjustment, an antimagnetic monocrystalline silicon balance-spring, and an extended 72-hour power reserve. Mounted on an articulated stainless steel link bracelet equipped with a tool-free quick-release interchangeable system and a double-safety folding clasp, it provides 100 metres (10 bar / 330 feet) of water resistance and is protected by an official 5-year Longines international warranty.

Key Highlights

• Exclusive Longines Calibre L844.4 Automatic: In-house Swiss mechanical movement featuring true "flyer" independent local jumping hour adjustment, 25,200 vph frequency, and a weekend-proof 72-hour power reserve.

• COSC-Certified Swiss Chronometer: Officially tested and certified by the Contrôle Officiel Suisse des Chronomètres for stringent timing accuracy across varied positions and temperatures.

• True "Flyer" GMT Travel Complication: Independent hour hand that jumps forward or backward in 1-hour increments without stopping the seconds or altering the home timezone hand.

• Ergonomic 39.00mm Case Proportions: Highly requested mid-size diameter engineered with a compact 46.80 mm lug-to-lug length for a balanced fit on diverse wrist sizes.

• Bidirectional Polished Blue Ceramic Bezel: Scratch-proof ceramic insert calibrated with an engraved 24-hour scale and a luminescent Super-LumiNova® triangle at 12 o'clock.

• Antimagnetic Silicon Balance-Spring: Monocrystalline silicon hairspring delivering high resistance to magnetic fields and superior long-term chronometric stability.

• Radiant Sunray Blue Dial: Dynamic radial sunburst finish that shifts between vibrant royal cobalt, electric sapphire, and deep navy tones under ambient light.

• Five Applied Dial Stars: Historic Longines symbol signifying the highest internal standards of movement quality, reliability, and precision.

• Domed Anti-Reflective Sapphire Crystal: Multi-layered anti-reflective coating on both inner and outer surfaces for maximum dial legibility from any cockpit angle.

• Solid Stainless Steel Link Bracelet: Ergonomic multi-link metal bracelet featuring brushed outer links and polished center segments with a quick-release strap changing system.

• Double-Safety Folding Clasp: Sturdy folding deployant buckle featuring dual push-piece release for reliable wrist retention.

• Robust 100-Metre Water Resistance: Tested to 10 bar (100 m / 330 ft) with a screw-in crown, offering complete security during swimming, recreation, and travel.

• Official 5-Year Longines International Warranty: Backed worldwide by Longines' 5-year guarantee provided for timepieces equipped with silicon balance technology.

Design & Craftsmanship

Aviation Dual-Time Heritage & The 39mm Steel Case Architecture

The Zulu Time collection traces its origin to 1925, when Longines created the first dual-time wristwatch featuring the "Zulu" flag—the universal nautical and aviation symbol for Greenwich Mean Time (Zero Meridian Time). Expanding upon the original 42 mm model, reference L3.802.4.93.6 answers the demand for tailored, versatile proportions. Measuring 39.00 mm across with a thickness of 13.50 mm and an ergonomic 46.80 mm lug-to-lug length, the case is sculpted from surgical-grade 316L stainless steel with vertical satin-brushed flanks and mirror-polished chamfers. The bidirectional rotating bezel features a polished blue ceramic insert impervious to scratches and UV fading, calibrated with 24-hour numerals to allow travelers to track up to three time zones simultaneously.

Sunray Blue Dial Depth, Applied Arabic Numerals & Super-LumiNova®

The dial architecture prioritizes high-contrast cockpit legibility, balanced symmetry, and vivid color play. Finished in an ultra-fine radial sunburst grain radiating from the center pinion, the deep blue dial reflects light across bright azure and deep oceanic tones. Applied silvered Arabic numerals and rhodium-plated baton hands are coated with Swiss Super-LumiNova® to emit an intense green glow in pitch-dark environments. A polished silver-toned GMT hand with an arrow tip sweeps across the 24-hour ceramic scale, while a symmetrical date aperture sits cleanly at 6 o'clock beneath the five applied steel stars. Applied diamond hour markers line the outer minute track, reinforcing vintage aviator instrument design.

COSC-Certified Calibre L844.4 Engineering & Quick-Release Steel Bracelet

Operating beneath the solid steel screw-down case back—embossed with the iconic Longines winged hourglass and globe emblem—beats the exclusive Calibre L844.4. Beating at 25,200 vibrations per hour (3.5 Hz) with 21 synthetic ruby jewels, this mechanical self-winding movement is certified as a Swiss Chronometer by COSC. Fitted with an antimagnetic monocrystalline silicon balance-spring, the calibre resists modern electromagnetic fields from laptops and mobile devices while delivering an extended 72-hour power reserve. The watch is paired with a solid 316L stainless steel multi-link bracelet engineered with an interchangeable quick-release mechanism, allowing the wearer to swap bracelets for leather or NATO straps without tools. The bracelet is fastened by a double-safety folding clasp with push-piece release.