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Sea Quartz 30 [42mm] - Black

33 reviews
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.

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Band: Stainless Steel

Stainless Steel
Black Tropic FKM Rubber
Orange Tropic FKM Rubber
  • 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.


Customer Reviews
4.9 Based on 33 Reviews
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Filter Reviews:
Andrew K.
United States United States
I recommend this product

Great timepiece

Classic dive watch, with distinctive look, I will be a regular buyer of your watches. I am a collector of new and retro watches.

Frank G.
United States United States
I recommend this product

Glad I bought it

Very well built watch with no flaws.Great lume and bezel action.Very comfortable!

Ben H.
United States United States
I recommend this product

Great watch @ great price!

Very happy with this purchase- nicely done!

Leon E.
United States United States
I recommend this product

A very Nice Watch

I was quite excited to see this watch come out. I placed an order for the first pre-order batch and could hardly wait it for it to arrive to me. When it arrived I was stunned as there is a lot of watches that look good in pictures in ads but look like **** in person. This watch looked even better in person then in the pics. The watch is not too big on the wrist and with its almost flat case back, it sits low on the wrist and there were times that I did not know I was wearing a watch until I looked down at it. The lume is good. It is not Seiko diver super bright lume but it will get you though a good part of the night with its lume. I think this is one of those watches that everybody needs to have. It is highly wearable and you can put it down and pick it up a week later and not need to set the time like an automatic watch. Mine has been bang on with the atomic clock since I set it the day i got it in Feb.

Momentum Watch Sea Quartz 30 [42mm] - Black Review
Tedd W.
United States United States
I recommend this product

Pleased as punch with purchase!

Extremely pleased with the process, the price, the service and the watch. I would have liked to be the owner of one of the original Sea Quartz Chronosport pieces, but am not, and cannot afford what they are bringing now, but this Momentum "tribute" watch is like a dream come true for me. It looks, feels and performs exactly like the original, and in fact IS a Momentum "original"....very happy with the purchase, glad I was able to get in on the "pre-sale" and have ordered the steel band which the manufacturers have graciously made available to purchasers of the first run of time pieces, also at a "special" price. Thank you for making this available, and affordable for all us working class guys! Short this watch!