NEW! GX-Diver's Ultramarine 44

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 Ultramarine is built on a solid, rugged case of surgical-grade 316L stainless steel, then takes on its dark gray tone through our Gray 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 uses a scratch-resistant blue 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, and the skeleton case back is secured with screws for a reliable seal. Water-resistant to 300 meters.

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

The 44mm Ultramarine's blue, multi-layer sandwich dial is built in stacked layers, with a wave-patterned top plate that adds real depth and shifts as light moves across it. Every hand-applied index is filled with BGW9 Swiss Super-LumiNova, and the date sits beneath a cyclops magnifier for easy reading. The sword-shaped hour and minute hands are brushed satin steel with lumed centers, while the orange second hand, tipped in BGW9, adds a hit of color with every sweep.

• Multi-layer wave sandwich dial
• Hand-applied, lumed indexes
• Orange lume-tipped seconds

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