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Eighty hour power reserve
Full day date aperture
Sunray cobalt blue dial
Exhibition sapphire case back
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Khaki King occupies an idiosyncratic corner of Hamilton’s military catalog. While standard Khaki references lean into austere field minimalism, the King adopts an assertive, almost executive posture without abandoning its utilitarian roots. Reference H64475140 updates this silhouette with an arresting sun-brushed blue dial, transforming a traditionally muted tool into a remarkably dynamic everyday companion.
In the metal, the case geometry makes an immediate impression. At 40mm across and 11.8mm thick, the brushed case flanks flow cleanly into sculpted crown guards that shield the push-pull crown from abrupt lateral shocks. Hamilton balances this satin casework with a high-polished sloping bezel, creating a play of light that allows the piece to transition effortlessly from weekend denim to office tailoring.
The dial execution remains the focal point. Its azure sunburst canvas shifts across lighting conditions, moving from deep midnight in shadow to vibrant cobalt under direct sunlight. The full weekday aperture arches across the twelve o’clock crest, sitting directly above a framed date aperture to establish a natural vertical equilibrium that reads at a glance. Syringe-style hands lined with Super-LumiNova glide over crisp white Arabic numerals, while a lumed arrow-tipped second hand precisely traces the fine outer chapter ring.
Brand: Hamilton
Gender: Men's
Brand Origin: Switzerland
Series: Khaki Field
Additional Information: Nivachron Anti-Magnetic Hairspring, EasyClick Quick-Release Bracelet, 80-Hour Autonomy
Model: H64475140
Movement: Automatic
Movement Source: Swiss Made
Power Reserve: Approx. 80 Hours
Precision: -10/+15 sec/day (Factory Calibrated)
Features: Full Day-Date Display, Luminous Hands and Hour Markers, Exhibition Caseback, Anti-Magnetic Balance
Engine: Hamilton Calibre H-40
Jewels: 25
Caliber No: H-40
Case Size: 40.0 mm
Lug-to-lug: 50.0 mm
Case Thickness: 11.8 mm
Band Width: 20 mm
Band Type: Bracelet
Dial Color: Blue (Sunray Brushed)
Case Color: Silver
Band Color: Silver
Bezel: Fixed
Bezel Color: Silver
Bezel Material: Stainless Steel (Polished)
Case Material: Stainless Steel (Polished)
Band Material: Stainless Steel (Polished)
Water Resistance: 100 m / 10 ATM / 10 Bar (330 ft)
Functions: Hours, Minutes, Central Seconds, Day of the Week, Date
Calender: Full Day Aperture and Date Window at 12 o'clock
Watch Style: Military / Field / Casual Luxury
Weight: Approx. 155 g
Warranty: 2-Year International Manufacturer Warranty
Case Back: Transparent Exhibition (Sapphire Crystal)
Case Shape: Round
Clasp: Folding Clasp with Push-Buttons
Crystal: Scratch-Resistant Sapphire
Crystal Coating: Anti-Reflective Coating
Crown: Push / Pull Crown with Crown Guards
LumiBrite: Super-LumiNova (Hands and Hour Markers)
Known By: Khaki Field King Auto 40mm, Khaki King Day-Date Blue, H64475140
Hamilton’s Khaki lineage is rooted in twentieth-century military history, shaped by decades of outfitting armed forces with rugged field instruments. During the Second World War, the Lancaster, Pennsylvania manufacture halted civilian production entirely to deliver over one million precision chronometers, deck watches, and military timepieces to Allied forces, earning the prestigious Army-Navy ‘E’ Award for manufacturing excellence.
As military specifications evolved through the mid-century into standardized field equipment like the GG-W-113 and MIL-W-46374, Hamilton codified the classic field watch archetype: high-contrast dials, robust Arabic numerals, and durable steel cases built to survive operational environments.
Visible through the sapphire display caseback is the Hamilton Caliber H-40, an automatic movement developed in close partnership with ETA (built upon the ETA 2834-2 base). Engineered to handle the rhythms of modern wear, the movement delivers an expansive 80-hour power reserve—allowing the watch to be set down on Friday evening and picked up Monday morning without missing a beat.
To achieve this extended autonomy, Hamilton optimized the kinetic chain: the barrel arbor was slimmed to accommodate a longer mainspring, while the operating frequency was calibrated to a steady 21,600 vibrations per hour (3 Hz). This rate conserves energy across the gear train while maintaining chronometric stability.
