Hazard 4 watch hands & indicators glow continuously (night or day,) powered by an unusual, government-regulated technology that combines hydrogen-3 gas (tritium/H3), glass tubes, and phosphors into self-contained mini-lamps (expertly Swiss-made in many colors.) Tritium bulbs don't charge by battery, sun, or flashlight, unlike other watches using simple luminescent paint or battery-run film. They don't fade overnight like those paints, and require no button pushing, or battery to exhaust. They are also feather-light. Tritium lights are usually used only for critical applications like military compasses, and night-sights; Hazard 4 nevertheless source them, since their watches are used by those for whom timing can determine survival/success or catastrophe. This version has a bead blast Titanium case, white dial, black characters and blue and red Tritium capsules. This is the Hazard 4 HeavyWaterDiver Blacktie "a".

• Self-contained everglow tritium-vial lamps
• Tritium vials are not inset but 80% above the face surface; this makes them visible from the edges not just from above
• Titanium case is light, strong, and hypoallergenic
• Large, substantial, 50 mm high-vis design
• Aggressively knurled unidirectional bezel
• Bezel has tritium marker in "12" porthole
• Scratch-resistant sapphire crystal glass
• Crystal interior is anti-reflective coated
• Machined bezel markers won't scratch off
• High water resistance feature set
• Screw-down case-back and crown
• The crown is large, grippy, and easy to turn
• Big, high-vis, 3D military stencil-cut numerals
• Unique 24-hour military time scale is integral
• Angled minutes inner-dial for better visibility
• Unique, user-service fast-change strap pins
• Boldly styled, broad, super legible hands
• Eye-catching retail graphic case-insert
• Easy strap changes w/ screw-in pins
• Moisture wicking map texture under the rubber strap, combined w/ relief trench & many buckle holes keep the wrist dry