39mm Combat B74 GMT

From Lum-Tec Watches

LÜM-TEC Combat B74 GMT The proven Combat B series has been continually evolved and improved since our original Combat B1 debuted in 2007. Built for demanding environments, the series has been used in military applications, from scorching deserts to freezing mountaintops. The B74 brings that established construction into a more compact 39mm case, with the added functionality of a true GMT movement. The Miyota 9075 automatic movement features an independently adjustable local hour hand, allowing the wearer to change time zones without disturbing the minute hand or GMT reference. Each movement is regulated in 6 positions after assembly and protected by our anti-shock mounting system. The forged 316L stainless steel case measures just 46mm lug-to-lug, with downward-curving lugs designed to fit comfortably on smaller wrists. A triple-layer dial, diamond-cut hands and our MDV luminous technology provide excellent legibility. Each B74 is assembled and tested by hand in Ohio and produced as a limited, individually numbered series of 500 pieces. Specs: 39mm case width, forged and heat treated 316L surgical grade stainless steel 13.8mm case thickness 46mm lug-to-lug 20mm lug width Fine bead blasted finish Anti-fingerprint coating 200 meters water resistance 28,800 BPH Miyota 9075 Japan ultra-slim automatic movement with true GMT, jumping individual hour setting, hacking and hand-winding features Timing adjusted in 6 positions after assembling for maximum accuracy Anti-shock movement mounting system Curved sapphire with military grade inner AR coating Exhibition caseback with sapphire window Threaded crown with double diamond seals and high-tech Viton® gaskets 2 nylon military style straps with hardened Titanium carbide hardware. Black and desert tan. 3 layer dial with bead blasted matte black and charcoal gray finish Diamond-cut premium hand set with back-filled X1 C3 luminous application MDV® Luminous Technology with Swiss X1 grade C3 Super-Luminova Lifetime free timing adjustment, seal cleaning and pressure testing Limited and numbered series of 500 worldwide 2-year limited warranty Designed, assembled by hand and fully tested in Ohio The Combat B cases are made from 316L surgical grade stainless steel. We use forged construction to re-align the metal grain structure to increase fatigue strength by 37% over a typical cast steel case. This also eliminates voids and porosity in the metal, allowing for the finest possible finishing level. A heat treatment is done to improve the stability of the metal during the forging process and to harden the metal surface after finishing. Bead blast finishing creates a micro work hardened surface to improve scratch and ding resistance by 8-10% over brushed or polished finishes. It leaves a smooth satin finish. We add a physical vapor deposited anti-fingerprint coating to fill microscopic pores from the bead blasting and leave an even smoother finish that prevents oily smudges and fingerprints on the case. The thick, slightly domed, Hytrel mounted sapphire creates a wider angle reflection which makes the dial easier to see without harsh reflection. Clarity is further enhanced by the military grade anti-reflective DLC coating applied to the inside of the sapphire. Silicone lubricated, double Viton gasket seals are in the crown and the tightly sealed, threaded caseback to resist saltwater, chemicals and extreme hot and cold environments. Our sealing system has been improved by over 200% since our original Combat B1 model and tested to exceed our 200 meter depth rating by 30%, ensuring complete sealing in not only water depths but in all environments. The case is designed with lugs that curve downward, wrapping around your wrist. The 46mm lug-to-lug length has a steep downward curve, allowing the watch to fit even a small wrist without feeling excessively large. The effective wrist span is closer to that of a 41-42mm lug-to-lug case. This is one of the reasons the Combat B case has remained a longtime fav