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Sea Quartz 30 [42mm] - Black


Before starting Momentum, our founder Simon and his family owned a watch company called Chronosport. In 1977, they launched one of the first-ever analog quartz diver’s watches, the Sea Quartz 30. The brand became so popular that it was soon sold in almost every serious dive store in the US and Canada. This watch was also famously worn by Tom Selleck in the first 3 seasons of the hit show Magnum PI.

Band: Stainless Steel

Stainless Steel
Black Tropic FKM Rubber
Orange Tropic FKM Rubber

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  • Iconic design based on one of the first quartz dive watches
  • Screw-down crown and 300M water-resistance rating
  • Thick C3 Super-LumiNova luminous markers, hands, and bezel
  • Scratchproof sapphire crystal and bezel insert
  • Swiss-made high-torque Ronda quartz (battery-powered) movement
  • Original watch worn by Tom Selleck in Magnum P.I.
  • Original brand owned by Momentum’s Founder & President
  • Movement: Swiss, Quartz (Battery), Ronda R507
  • Dial Color: Black
  • Crown: Screw-down crown
  • Water Resistance (m/ft) : 300 / 990
  • Case Material: Stainless Steel
  • Crystal: Sapphire Only
  • Case Diameter: 42mm
  • Case Height: 11.3mm
  • Lug Width: 20mm
  • Lug-to-Lug: 47mm
Sea Quartz 30 [42mm] - Black
Sea Quartz 30 [42mm] - Black
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.

Sea Quartz 30 [42mm] - Black
Authentic History, Better Performance

The Sea Quartz 30 models from the 1980’s have built an almost cult-like following with Magnum fans, divers, and watch fanatics. To make them proud, we recreated the Sea Quartz 30 as closely as possible to the original. Our historical connection to Chronosport meant we could send genuine cases, dials, hands, and bezels directly to our factories so they could analyze and match the design. Of course, we wanted to make some key improvements. The dial, hands, and bezel now feature C3 Super-LumiNova for vastly improved lume performance over the original. The original watch also featured a mineral bezel and crystal, which has been replaced with scratchproof sapphire for unmatched durability. What we didn’t change is the iconic design.