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Jack Mason Strat-o-timer Automatic GMT

What’s better than another dive watch?

A better dive watch.

We solved a few things.

More Accurate

We regulate the movement for significantly higher accuracy.

Fewer Scratches

Scratch-resistant coating helps protect against minor blemishes.

Built in the USA

Assembled and tested in America for extra quality control.

And yes, it has the usual dive specs.

See Full Specifications

Movement


Caliber
Miyota 9039

Movement Type
Automatic

Jewels
24

Accuracy
+/-5 seconds per day (regulated by Jack Mason)

Features
Hours, Minutes, Running Second

Vibration Frequency
28,800 vph

Power Reserve
42 Hours

Case & Dial


Material
316L Stainless Steel

Diameter
40mm

Thickness
13mm

Lug Width
20mm

Lug to Lug
47mm

Depth Rating
300m, 30 ATM

Crown
Screw-down

Bezel
120-click with lume

Lume
Swiss Super-LumiNova®

Crystal Type
Double-domed, Boxed Sapphire

Caseback
Closed

Bracelet


Material
316L Stainless Steel

Width
20mm > 16mm taper

Buckle
On the fly micro-adjust

End Link
Solid with quick-release

Links
Screwed

A Next-Level Watch Wearing Experience

Pair With A Suit

Wetsuit, Swimsuit, or Suit. Like any tool watch, the Hydrotimer was designed to accompany you for a specific task. However, it’s suitable for every task from ocean exploration to formal events. Intentionally made to be an everyday staple — as effective above the surface as it is below.

Accurate to +/-5 Seconds

Regulated for increased accuracy. It is important to us that every Hydrotimer is as precise as possible. We regulate each movement in the USA to maximize its performance. Before regulation, the stock accuracy of the movement is +30/-10 seconds per day. That wasn’t going to cut it.

Meant to be Worn

Protected by a scratch-resistant coating. A watch destined to be worn everyday should be durable enough to avoid scratches. The coating increases the scratch-resistance by roughly 500%, which results in a Hydrotimer that endures against the desk of a typist just as well as it does the rigors of more demanding adventures.

Investing In American Assembly

Extra levels of quality control. Bringing watch assembly to the USA allows us to have full ownership over quality control and provide an even better post-purchase experience. We are steadily investing in fulfilling our vision of establishing ourselves as a legacy brand that holds generational value.

Jack Mason Strat-o-timer Automatic GMT

Media Mentions

See how the Hydrotimer has been making a splash following its announcement in April of 2023.

“As you may have gathered by now, Jack Mason is a brand that always goes the extra mile.”
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“It certainly strikes a good balance between the new and the classic. It looks different than many divers while displaying the archetypal traits of an icon.”
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“A vintage-inspired dive watch assembled and regulated in the U.S. to impressive timekeeping accuracy.”
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“Unlike clunky competitor dive watches, the Hydrotimer 300 is designed for the everyman.”
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Hydrotimer 300m

  Available in 4 Colors