The LÜM-TEC Combat B64 Chronograph is a rugged, highly legible field watch designed for dependable everyday use, precise elapsed-time measurement, and reliable performance in demanding environments.
Built around LÜM-TEC’s proven Combat B platform, the B64 combines a forged and heat-treated 316L stainless steel case with a military-grade gunmetal titanium-carbide PVD coating, anti-shock movement mounting system, curved sapphire crystal, and 200-meter water resistance.
The precision Miyota OS21J chronograph movement provides a 60-minute timer, dedicated 24-hour indicator, and approximately five years of battery life. Its matte-gray dial, diamond-cut hands, and proprietary MDV® luminous technology provide exceptional visibility during the day and a powerful blue glow in dark conditions.
Designed, hand assembled, and fully tested in Ohio, the Combat B64 Chronograph is limited to only 500 individually numbered watches worldwide.
Features
- Precision Miyota OS21J chronograph movement
- 60-minute elapsed-time chronograph
- Dedicated 24-hour subdial indicator
- Approximately five-year battery life
- Proprietary anti-shock movement mounting system
- Forged and heat-treated surgical-grade 316L stainless steel case
- Military-grade titanium-carbide gunmetal PVD hard coating
- Durable bead-blasted case finish
- Anti-fingerprint surface treatment
- Curved sapphire crystal with military-grade inner anti-reflective coating
- Threaded crown with dual diamond seals
- Solid threaded caseback with dual diamond seals
- High-performance Viton® gaskets
- 200-meter water resistance
- Anti-reflective matte-gray dial
- Diamond-cut premium hands
- MDV® luminous technology
- Thirty layers of custom X1-grade Swiss Super-LumiNova
- Powerful blue nighttime glow
- Two premium military-style straps included
- Designed, assembled by hand, and fully tested in Ohio
- Individually numbered edition of 500 watches
- Two-year limited warranty
- Lifetime battery replacement, seal cleaning, and pressure testing
Specifications
- Model: Combat B64 Chronograph
- Movement: Miyota OS21J quartz chronograph
- Chronograph: Precision 60-minute timer
- Additional Display: 24-hour subdial indicator
- Battery Life: Approximately five years
- Case Material: Forged and heat-treated 316L stainless steel
- Case Finish: Bead blasted with gunmetal titanium-carbide PVD coating
- Case Diameter: 43mm
- Case Thickness: 13.6mm including the domed sapphire crystal
- Lug-to-Lug Length: 51.5mm
- Lug Width: 22mm
- Crystal: Curved sapphire with military-grade inner anti-reflective coating
- Crown: Threaded with dual diamond seals
- Caseback: Solid threaded caseback with dual diamond seals
- Gaskets: Viton®
- Water Resistance: 200 meters
- Dial: Anti-reflective matte gray
- Hands: Premium diamond-cut hands with X1-grade Super-LumiNova
- Lume: MDV® technology with 30 layers of custom X1 Swiss C3 BL Super-LumiNova
- Lume Color: Blue
- Included Straps: One leather strap and one heavy-grade gray nylon strap
- Strap Hardware: Gunmetal PVD
- Production: Limited and numbered series of 500 worldwide
- Warranty: Two-year limited warranty
Engineered for Hard Use
The Combat B64 case begins as forged surgical-grade 316L stainless steel. The forging process realigns the steel’s grain structure, increases fatigue strength, and eliminates the voids and porosity that can occur in cast cases. Heat treatment further stabilizes and hardens the steel before the final finish is applied.
A bead-blasted surface creates a smooth satin appearance while improving resistance to scratches and small impacts. The military-grade gunmetal titanium-carbide PVD coating adds another protective layer, while an anti-fingerprint treatment helps resist oily marks and smudges.
Precision Chronograph Performance
The Japanese Miyota OS21J quartz chronograph movement provides accurate and dependable timing with minimal maintenance. Its 60-minute chronograph makes it easy to measure elapsed time, while the dedicated 24-hour indicator distinguishes daytime from nighttime hours.
With approximately five years of battery life and LÜM-TEC’s lifetime complimentary battery-replacement program, the B64 provides a practical and dependable long-term ownership experience.
Exceptional Low-Light Visibility
The matte-gray dial and premium diamond-cut hands are treated with LÜM-TEC’s proprietary MDV® luminous technology. More than 30 layers of custom X1-grade Swiss Super-LumiNova are applied over a specially treated reflective base.
This construction directs the luminous output through the front of the watch, producing a strong blue glow and excellent visibility in dark or low-light conditions.
Protection from the Elements
The curved sapphire crystal provides excellent scratch resistance and a wide viewing angle. A military-grade anti-reflective coating is applied to the inside of the crystal to reduce glare without exposing the coating to external wear.
Silicone-lubricated Viton® seals, a threaded crown, and a tightly secured threaded caseback help protect the movement from water, salt, chemicals, and extreme temperatures. Every watch is pressure tested before leaving LÜM-TEC’s Ohio facility.
Comfortable and Secure Fit
The downward-curving lugs allow the 43mm case to wrap naturally around the wrist. Although the measured lug-to-lug length is 51.5mm, the pronounced curvature creates a more compact effective fit and makes the watch comfortable on a wide range of wrist sizes.
Two military-style straps are included: one leather strap and one heavy-grade gray nylon strap with matching gunmetal PVD hardware. The nylon strap passes through both spring bars, helping keep the watch attached if one spring bar becomes damaged.
American-Built Quality
Every LÜM-TEC watch is designed and engineered in Ohio, individually assembled by hand, and fully tested before shipment. The movement is secured within LÜM-TEC’s proprietary anti-shock mounting system to help maintain reliability following accidental drops and hard impacts.
The Combat B64 Chronograph is backed by a two-year limited warranty and LÜM-TEC’s lifetime service program, including complimentary battery replacement, seal cleaning, and pressure testing.
