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Silver stainless steel round 44mm case with slate grey blue sunray dial black ceramic unidirectional bezel black silicone strap

Deep Blue

Deep Blue MSTR442SLATEBLUESTRP 44mm Automatic Watch

SKU CH-5VHZ-H1NY6 MPN MSTR442SLATEBLUESTRP

44 mm automatic diver with a Seiko NH35 movement, sapphire crystal, ceramic unidirectional bezel, helium valve and 300 m water resistance on a black silicone strap

  • MaterialStainless Steel
  • ColorSilver
  • Dial ColorSlate-Grey
  • Automatic Seiko NH35 movement delivers reliable 21,600 VPH timekeeping
  • Sapphire crystal with anti-reflective coating resists scratches for clear legibility
  • 300 m water resistance plus helium valve supports serious diving
  • Ceramic unidirectional bezel with 120 clicks tracks elapsed time securely
  • 44 mm stainless-steel case with display back shows the movement inside

Product Identity

The Deep Blue Master 1000 II is a 44mm automatic diver's watch built for serious underwater use. Its stainless steel case houses a Seiko NH 35 movement visible through a display case back. A black ceramic unidirectional bezel with 120 clicks and a helium release valve complete the professional specification.

Upgrade Context

This model replaces entry-level dive watches that lack ISO-grade water resistance or a screw-down crown. The jump is justified when you need a 300m depth rating, a sapphire crystal with anti-reflective coating, and a movement running at 21,600 VPH with 24 jewels. It is not for buyers who want a slimmer profile under a dress cuff or a lighter titanium construction.

Compatibility Check

Verify that a 44mm case diameter and 15mm thickness suit your wrist size and daily comfort preferences. Confirm the 22mm lug width matches any aftermarket straps you may intend to use. Ensure the 8-1/2 inch silicone strap length accommodates your wrist circumference, especially over a wetsuit sleeve.

Highlights

  • Automatic Seiko NH35 movement delivers reliable 21,600 VPH timekeeping
  • Sapphire crystal with anti-reflective coating resists scratches for clear legibility
  • 300 m water resistance plus helium valve supports serious diving
  • Ceramic unidirectional bezel with 120 clicks tracks elapsed time securely
  • 44 mm stainless-steel case with display back shows the movement inside

Specifications

MaterialStainless Steel
ColorSilver
Dial ColorSlate-Grey

Questions about this item

What strap width does the 44mm case accept?

The lugs are spaced for a 22mm band, and the included black silicone strap measures 22mm wide by 8-1/2" long.

How do I set the time and date on the Seiko NH35 movement, and what step is often missed?

Unscrew the crown, pull to the first click for the date, second click for the time; the step many skip is screwing the crown back down to keep the 300m seal intact.

When will the sapphire crystal or ceramic bezel need replacement?

Sapphire crystal and ceramic bezel are highly scratch-resistant; they typically only need replacement after a hard impact that chips or cracks them.

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