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Round stainless steel diver's watch, black dial, silicone strap, 39.9 mm case

Orient

Orient Mako RA-AC0Q10N Automatic Diver's Watch Black Dial Silicone Strap 39.9mm 200m

SKU CH-NP4Z-EF9XA

Automatic diver's watch with 39.9 mm stainless steel case, sapphire crystal, unidirectional rotating bezel and 200 m water resistance on a silicone strap

  • StyleDiver's
  • MaterialStainless Steel
  • MovementAutomatic
  • ShapeRound
  • Dial ColorBlack
  • Dial MarkersIndex
  • Automatic movement runs without a battery
  • 200 m water resistance suits serious diving
  • Sapphire crystal resists scratches and knocks
  • Unidirectional rotating bezel tracks elapsed time safely
  • 9 mm stainless-steel case fits most wrists

Orient Mako Automatic Diver's Watch

The Orient Mako RA-AC0Q10N is a mechanical diver's watch built around an automatic movement. A 39.9 mm stainless steel case houses a black analog dial with index markers and a date window. The unidirectional rotating bezel and 200 m water resistance suit recreational diving, while the sapphire crystal resists scratches during daily wear.

Upgrade from Quartz or Entry-Level Mechanical

This watch replaces battery-powered quartz models or basic automatics that lack a screw-down crown and 200 m rating. The jump is worth it when you need ISO-style dive timing via the unidirectional bezel and a sapphire crystal that maintains clarity after repeated salt-water exposure. Buyers who require a helium-escape valve or a depth rating beyond 200 m should look elsewhere.

Strap Swap and Crown Discipline

The silicone strap uses a standard buckle, so changing to a different 20 mm band is straightforward with a spring-bar tool. The screw-down crown must be fully tightened before water entry; forgetting this step is the most common cause of moisture ingress. No special tools are required for routine strap changes or time setting.

Highlights

  • Automatic movement runs without a battery
  • 200 m water resistance suits serious diving
  • Sapphire crystal resists scratches and knocks
  • Unidirectional rotating bezel tracks elapsed time safely
  • 9 mm stainless-steel case fits most wrists

Specifications

BrandOrient
StyleDiver's
MaterialStainless Steel
MovementAutomatic
ShapeRound
Dial ColorBlack
Dial MarkersIndex
DisplayAnalog
DateDate
Band MaterialSilicone
FastenerBuckle
GenderMale
ConditionNew
BezelUnidirectional Rotating Bezel
Case BackScrew Down Crown
Case Diameter39.9
Case MaterialStainless Steel
CrystalSapphire Crystal
Water-Resistant200m
Special FeaturesSapphire Crystal,Buckle Clasp,Date Display,Screw Down Crown

Questions about this item

What lug width does the 39.9 mm case need for a replacement strap?

The watch takes a standard 20 mm lug width, so any 20 mm silicone or rubber strap will fit the 39.9 mm case.

How do I set the time and date on the automatic movement without damaging the crown?

Unscrew the screw-down crown fully, pull to the first click for date, second click for time, then push and screw it back down to keep 200 m water resistance.

When should the sapphire crystal or gaskets be checked to maintain 200 m water resistance?

Have a watchmaker pressure-test the gaskets and inspect the sapphire crystal seal every two to three years or after any hard impact.

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