If you are comparing Fifty Fathoms tritium replicas, start with the 42mm sapphire-crystal build. It is the version that gets the domed glass, the coin-edge bezel grip and the warm aged lume closest to right, and it is the one most buyers keep. The alternatives below suit smaller wrists and lighter budgets, but neither matches its dial depth. Here is the pick first, then the options.
Key Features
- 42mm brushed stainless steel case with drilled lugs and period-correct proportions
- Double-domed sapphire crystal with inner anti-reflective coating
- Tritium-style aged lume in cream-to-pumpkin tone, applied by hand
- Coin-edge unidirectional rotating bezel with sapphire or aluminum insert
- Automatic movement with hacking seconds and hand-winding
- Screw-down crown and caseback, sealed for swimming and showering
- 22mm lug width, so standard aftermarket straps fit without adapters
- Matched lume plots across dial, hands and bezel pip
Materials and Specifications
All three versions use a 316L stainless steel case, brushed on the flanks with lightly polished chamfers, closed by a screw-in caseback over a rubber gasket. The crystal is double-domed sapphire with an inner anti-reflective coating, which is what gives the dial its soft, slightly magnified edge. Inside sits a 21-jewel automatic movement with a power reserve of roughly two days, plus hacking and hand-winding for easy setting. The lume is the same hand-applied compound across every version, so the color stays consistent in daylight and glows a soft green-aqua in low light. Case thickness runs about 13.5mm on the 42mm model and closer to 12mm on the slimmer option.
Fifty Fathoms Tritium Replica Lume Buying Guide
Which Fifty Fathoms Tritium Replica Should You Pick First?
The 42mm sapphire-crystal version. It offers the best balance of dial depth, bezel action and wrist presence, and it takes strap changes without any modification.
Fifty Fathoms Tritium Dial: A Real Buyer's Guide
What Are the Other Options?
A 40mm slim case for smaller wrists and a no-date dial for anyone who prefers a cleaner, more vintage look. Both share the same movement and lume, so the choice comes down to size and dial layout.
Fifty Fathoms Tritium Replica AAA Quality Guide
Is the Tritium Lume Actually Radioactive?
No. These use a modern luminous compound aged to mimic the patina of old tritium, so there is nothing radioactive and no fading over time.
Shipping and Returns
Orders ship within a few business days in a padded travel case with tracking provided, and most destinations receive delivery inside two weeks. If the watch is not right for you, returns are accepted within 30 days as long as it comes back unworn with the case and paperwork intact.