Lum-Tec Combat B71 | USA Assembled Field Watch with MDV Lume

The Lum-Tec Combat B71 pairs a black titanium carbide PVD-coated case with a matte black dial and distinctive dark-orange Super-Luminova as part of Lum-Tec's MDV® luminous technology. A Swiss Ronda 515 quartz movement powers this 43 mm field watch, with a curved sapphire crystal and 200 meters of water resistance.

Two nylon straps, one black and one gray, come with matching black PVD hardware. Hand assembled and tested in Ohio, the B71 is limited to 500 numbered pieces worldwide. The CGA Company sells it new as an authorized Lum-Tec dealer, with free USA shipping.

The Combat B71 is part of Lum-Tec's Combat B series, the field watch line Lum-Tec has kept refining since the first Combat B1 arrived in 2007. Lum-Tec says Combat B watches have been battle tested in real military applications and in environments from deserts to freezing mountaintops, and that they are trusted by pilots, ground soldiers, snipers and mountain climbers. Lum-Tec says the Combat B is comfortable on the wrist, legible and accurate, and that its anti-shock capability is well proven in the field.

Specifications

• Case width: 43 mm, forged 316L surgical-grade stainless steel, heat treated for hardness
• Coating: Military-grade titanium carbide black PVD hard coating
• Finish: Bead blasted, with anti-fingerprint coating
• Thickness: 13.6 mm including the domed sapphire
• Lug to lug: 51.5 mm
• Lug width: 22 mm
• Water resistance: 200 meters
• Movement: Swiss Ronda 515 quartz
• Shock protection: Anti-shock movement mounting system
• Crystal: Curved sapphire with military-grade DLC anti-reflective coating on the inside
• Caseback: Threaded 316L stainless steel
• Crown: Threaded, double Viton® seals
• Gaskets: Viton®
• Dial: Matte black with X1-grade dark orange Super-Luminova
• Hands: Diamond-cut, filled with X1-grade dark orange Super-Luminova
• Lume: MDV® luminous technology on dial and hands
• Straps included: 2 heavy-grade nylon military straps (one black, one gray) with black PVD hardware
• Warranty: 2-year limited warranty
• Edition: Limited and numbered, 500 pieces worldwide
• Assembly: Designed, assembled by hand and fully tested in Mentor, Ohio

Construction

The B71 case is forged from 316L steel, heat treated and bead blasted, then given a black titanium carbide PVD hard coat and an anti-fingerprint layer. Lum-Tec says forging gives about 37% more fatigue strength than a typical cast case, and that the bead-blast finish creates a micro work-hardened surface that improves scratch and ding resistance by 8-10%.

A domed, Hytrel-mounted sapphire with inner AR coating keeps glare down. The threaded crown and caseback use silicone-lubricated double Viton® seals. Lum-Tec says its sealing has improved by more than 200% since the first Combat B1, and that it is tested to 30% beyond the 200 m rating. An anti-shock mount protects the Swiss quartz movement from drops.

Heat treatment does two jobs on this case: it keeps the steel stable while it is being forged and hardens the surface once finishing is done. The glare-cutting layer on the inside of the sapphire is a military-grade DLC anti-reflective coating. The case seals are there to stand up to salt water, chemicals and very hot or very cold conditions, not just water pressure, and if the watch is dropped on a hard floor or knocked against a wall, the anti-shock mount lets the movement absorb the hit.

Fit and Straps

The lugs curve down steeply, so the 51.5 mm lug-to-lug wears like roughly 46-47 mm, according to Lum-Tec. The two heavy nylon straps, one black and one gray, have black PVD hardware to match the case. Each strap runs under both spring bars, so the watch stays on if a spring bar breaks.

Lum-Tec says its nylon straps are more durable than typical straps of this type and are designed for easy adjustment, a secure fit and minimal weight on the wrist.

MDV® Lume

The matte black dial and the diamond-cut hands use X1-grade dark orange Super-Luminova, part of Lum-Tec's MDV® luminous technology. On the dial it is printed in more than 30 layers over a reflective base so the light goes forward. Lum-Tec says RcTritec in Switzerland verified its dials as top Super-Luminova performers.

Lifetime Service

Lum-Tec covers free battery replacement, seal cleaning and pressure testing on the B71 for life, in Ohio. Lum-Tec says it regularly sees its watches come back for service after 15 or more years of use, and it puts what it learns from them into new designs. Lifetime services are provided by Lum-Tec under Lum-Tec's terms, not by The CGA Company; for service, contact service@lum-tec.com.

Hand Assembled and Tested in Mentor, Ohio

Lum-Tec says its watches are designed and engineered in Ohio from the ground up, and every Combat B71 is hand assembled and individually tested in Mentor, Ohio, using international and domestic components; the movement in this model is the Swiss Ronda 515 quartz. Lum-Tec says that since 2007 it has produced watches for more than 100 brands around the world, the U.S. government and SWAT teams.

Frequently Asked Questions

What movement does the B71 use?
A Swiss Ronda 515 quartz, protected by Lum-Tec's anti-shock mounting system.

What color is the lume?
Dark orange. The dial and hands use X1-grade dark orange Super-Luminova as part of Lum-Tec's MDV® luminous technology.

How is it different from the B73?
The B71 has a black titanium carbide PVD coated case and dark orange lume. The B73 is uncoated bead-blasted steel with grade A BGW9 lume. Both use the Swiss Ronda 515.

Where is the Combat B71 assembled?
Lum-Tec hand assembles and tests every Combat B71 in Mentor, Ohio, using international and domestic components. The movement is the Swiss Ronda 515 quartz.

Which straps come with it?
Two 22 mm heavy-grade nylon military straps, one black and one gray, with black PVD hardware.