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Sea Quartz 30 [42mm] - Black
The Dive Watch That Started It All
Original spec. Modern upgrades. Legendary status.
Before launching Momentum, our founder Simon and his family introduced the Sea Quartz 30 in 1977 under the Chronosport name one of the first analog quartz dive watches on the market. It quickly became a favorite among military divers and even made its way onto the wrist of Tom Selleck in the first three seasons of Magnum P.I..
Rebuilt from the original case design and upgraded with modern materials, the new Sea Quartz 30 stays true to its roots: rugged, reliable, and ready for anything.
✅ High-Torque Swiss Movement – Built for maximum durability and long-term accuracy.
✅ Sapphire Crystal – Scratch-resistant and vintage-inspired, just like the original.
✅ 300M Water Resistance – With screw-down crown and caseback for real dive performance.
✅ Matte 316L Stainless Steel Case – Bead-blasted for a no-glare, no-nonsense finish.
✅ Super-LumiNova® Hands & Markers – Glows bright through the night for effortless readability.
✅ Assembled in Canada – Designed and tested for life in and out of the water.
✅ Magnum P.I. Approved – A direct descendent of the iconic watch worn by Thomas Magnum himself.
Select an Optional Band for Sea Quartz 30 [42mm] - Black
Add an Optional Engraving for Sea Quartz 30 [42mm] - Black
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SPECS
- Movement Swiss, Quartz (Battery), Ronda R507
- Dial Color Black
- Screw-down crown
- Water Resistance 300 / 990
- SKU: [sku]
- Battery: 371
DIMENSIONS
- Case Diameter 42mm
- Case Height 11.3mm
- Lug Width 20mm
- Lug-to-Lug 47mm
MATERIAL
- Stainless Steel
- Sapphire Only
- Movement Swiss, Quartz (Battery), Ronda R507
- Dial Color Black
- Screw-down crown
- Water Resistance 300 / 990
- SKU:
054AADAFC-AB-B-AC-B-AC-CLKA-D-A-B - Battery: 371
- Case Diameter 42mm
- Case Height 11.3mm
- Lug Width 20mm
- Lug-to-Lug 47mm
- Stainless Steel
- Sapphire Only

The Original Magnum P.I. Watch
In the early 1980’s, CBS launched the TV series Magnum PI. Set in Hawaii, it starred Tom Selleck. The series consistently ranked in the top 20 U.S. television programs for several years, finishing as high as number 3 for the 1982–83 season. And the watch that Tom Selleck wore for the first 3 seasons? Of course, it was the original Chronosport Sea Quartz 30.