GX-Diver's 44mm Black Full Lume

This watch runs on the La Joux-Perret G100, a newer-generation Swiss automatic built in La Chaux-de-Fonds. Its standout feature is a 68-hour power reserve. Take it off Friday night, and it's still running Monday morning.

The G100 has 24 jewels and beats at 28,800 vph for a smooth, sweeping seconds hand. It includes hacking seconds and a date. It's finished to a soigné standard with Côtes de Genève striping, visible through the exhibition caseback.

Accuracy is rated at ±5 seconds per day, tighter than most movements in its class.

• Caliber: La Joux-Perret G100
• Jewels: 24
• Frequency: 28,800 vph (4 Hz)
• Power reserve: 68 hours
• Finish: soigné, Côtes de Genève
• Accuracy: ±5 sec/day

Case Dimensions

• Case Diameter: 44.0 mm
• Case Thickness: 12.9 mm
• Lug-to-Lug: 52.0 mm
• Lug Width: 23.0 mm
• Weight (on bracelet): 108 g

Wrist Fit

• Leather strap: 6.5 to 8.75 in (16.5 to 22.2 cm)
• Rubber strap: 6.5 to 9.5 in (16.5 to 24.1 cm)
• Bracelet: 6.5 to 10.5 in (16.5 to 26.7 cm)

Not sure of your wrist size? Check out our Know Your Wrist Size Guide.

The 44mm Black Full Lume starts with a solid, rugged case of surgical-grade 316L stainless steel, then takes on its stealth black tone through our Black Color Fusion process, with the color fused into the steel so it will never come off under normal wear and tear. The 120-click unidirectional bezel carries a scratch-resistant polished black ceramic insert inlaid with BGW9 Swiss Super-LumiNova, so it stays sharp by day and glows at night. An anti-reflective sapphire crystal sits on top, the skeleton case back is fastened with actual screws for a secure seal, and the case is water-resistant to 300 meters.

• Black Color Fusion over 316L steel
• 120-click black ceramic bezel
• Screwed skeleton case back

White by day, full glow by night. The 44mm Black Full Lume's full lume multi-layer sandwich dial is coated in BGW9 Swiss Super-LumiNova, so the entire face lights up in the dark, while the wave-patterned top layer keeps it textured in daylight. Anthracite sword-shaped hands with lumed centers read sharply against the white, and the orange second hand adds a flash of color.

• Full lume BGW9 dial
• Anthracite lumed hands
• Orange second hand

300m Water Resistance, Screw-Down Crown

This watch is water-resistant to 300 meters (30 bar), so it's built for swimming, snorkeling, and recreational scuba diving, as well as everything on land.

The screw-down crown threads tightly into the case and presses against a gasket to seal out water, dust, and pressure. Screw it in snugly after setting the time, and the case stays sealed.

• Water resistance: 300m / 30 bar / 1,000 ft
• Suitable for: swimming, snorkeling, recreational diving
• Crown: screw-down, with gasket seal

Sapphire Crystal, Front and Back

Both crystals are synthetic sapphire, rated 9 out of 10 on the Mohs scale, second only to diamond. Keys, zippers, and desk edges won't scratch either side.

The anti-reflective coating goes on the inside only, front and back. Outer coatings smudge and wear, so the surfaces you touch stay pure sapphire. You get a glare-free view of the dial and the movement.

• Material: synthetic sapphire, front and back
• Hardness: 9 out of 10 on the Mohs scale
• Coating: anti-reflective, inside only
• Outer surfaces: uncoated, for full scratch resistance