Lüm-Tec · Microbrand · United States

Lüm-Tec Combat B73

Ref. LTB73 · Limited · limited to 500 · Pilot

Lüm-Tec Combat B73, matte black pilot dial, steel case, front view
Photo: Lüm-Tec
  • Lüm-Tec Combat B73 on a black nylon strap
  • Lüm-Tec Combat B73 lume shot
  • Lüm-Tec Combat B73 case side
From $545
  • Ronda 515
  • 43 mm × 13.6 mm
  • Sapphire crystal
  • 200 m water resistance

Movement

Caliber
Ronda 515
Type
Quartz
Tier
Mid
Complications
Hours, Minutes, Seconds
Frequency
n/a
Power reserve
n/a
Hacking
n/a
Accuracy (factory)
-10 / +20 s/month
Modifications
Anti-shock movement mounting system

Case

Diameter
43 mm
Lug to lug
51.5 mm
Thickness
13.6 mm
Lug width
22 mm
Material
Steel (316L)
Hardening
—
Water resistance
200 m
Crown
Screw-down
Case back
Solid, screw-down
Bezel
Fixed
Finishing
Bead-blasted, with a PVD anti-fingerprint coating

Crystal & dial

Crystal
Sapphire
Shape
Domed
Anti-reflective
Inner
Lume
Super-LumiNova BGW9 (grade A), blue glow (MDV Luminous Technology on dial and hands)

Bracelet

Bracelet
—

Straps

Strap 1
NATO, Two heavy-grade pass-through nylon military straps, one black and one grey, with black PVD hardware

Weight

Head only
—
On bracelet
—
On strap
—

Prices

VariantConfigurationTypePriceUSDAs ofSource
All—Msrp545 USD$5452026-10-24link

About this entry

80% of key specs known. Missing: weight, hardening, bracelet offered.

Sold as "Combat B73". Limited and numbered series of 500. Swiss Ronda 515 quartz. Matte black B-Uhr style dial; no date window is visible in the brand's photos, so the date is recorded as absent. Brand specs: 43mm, 13.6mm including the domed sapphire, 51.5mm lug-to-lug, 22mm lugs, 200 m, threaded solid steel caseback (solid per the brand's caseback photos). Uncoated bead-blasted steel (no PVD). Inner anti-reflective coating on the sapphire. MDV Luminous Technology, per the brand: the dial is printed with over 30 layers of Super- LumiNova over a chemically coated reflective base so the glow is directed out of the front rather than lost into the dial, and RC Tritec in Switzerland tested and verified its dials as top performers. Brand case claims: forged 316L (forging said to raise fatigue strength 37% over a cast case), heat treatment "to increase metal hardness" (not recorded as hardening: no surface treatment or hardness is given), bead-blast finish said to improve scratch resistance by 8-10%, PVD anti-fingerprint coating, double Viton gaskets in the threaded crown and caseback, tested to 30% beyond the 200 m rating. The lugs curve down steeply; the brand says the 51.5mm lug-to-lug wears like a 46-47mm one. Fixed knurled (coin-edge) bezel and no crown guards, from the brand's photos. The included straps are pass-through nylon military straps that loop through both spring bars. No bracelet comes with the watch; Lüm-Tec sells Combat B bracelets separately as accessories. Weight is not published. The B73 is the uncoated-steel, BGW9-lumed counterpart of the B71. Listing created December 2025, published on the store in January 2026.

Last verified: 2026-10-25. Edit or correct this entry.

Sources