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Round 44mm steel diver watch with glossy blue-black gradient dial and black ceramic bezel on steel bracelet

OceanX

OceanX Sharkmaster 600 SMS600-12 44mm Blue Dial Automatic Diver Watch

SKU CH-M9S7-0CB4K MPN SMS600-12

A 44 mm automatic diver watch rated to 600 m with a sapphire crystal, ceramic bezel and Seiko NH35 movement

  • Watch face colorBlue-Black
  • Main materialSteel
  • Product colorSilver
  • Automatic Seiko NH35 movement powers the watch without a battery
  • 600 m water resistance meets professional diver standards
  • Sapphire crystal resists scratches better than mineral glass
  • Unidirectional ceramic bezel tracks elapsed dive time safely
  • 44 mm steel case with screw-down crown ensures robust sealing

OceanX Sharkmaster 600 Diver Watch

The OceanX Sharkmaster 600 SMS600-12 is a 44mm automatic diver watch built for serious underwater exploration. Its 600m water resistance and screw-down crown meet professional diving requirements. The Seiko NH35 movement provides reliable timekeeping without battery changes. This steel timepiece suits enthusiasts who demand genuine dive capability.

Steel Bracelet and Sapphire Crystal

The integrated steel bracelet with 21mm width matches the case for a unified look and secure fit on the wrist. A sapphire crystal protects the glossy blue-to-black gradient dial from scratches during active use. The unidirectional ceramic-steel bezel tracks elapsed dive time safely. Luminous hands and hour markers ensure legibility in low-light conditions.

Automatic Movement Practical Limits

The Seiko NH35 automatic calibre runs at 21,600 vibrations per hour with 24 jewels and requires regular wrist motion to maintain power reserve. Time-only accuracy varies with position and temperature unlike quartz-regulated alternatives. The date function advances only forward and cannot be adjusted quickly near midnight. Manual winding via the crown is necessary after extended storage periods.

How it compares

Measured against everything we stock in Analog & Digital Wristwatches, at today’s prices. Recalculated every night.

Price $357.99
Pricier than about 86% of the 2,679 comparable items (median $130.99).

Specifications

Product
Product colorSilver
Watch face colorBlue-Black
Size & build
Main materialSteel

Questions about this item

How often does the Seiko NH35 movement need servicing?

Mechanical movements like the Seiko NH35 generally require professional servicing every three to five years to maintain lubrication and timekeeping accuracy.

What limits continuous daily wear of the 44 mm steel case?

The 15 mm case thickness and solid steel bracelet add noticeable wrist weight that may become fatiguing during extended all-day wear.

How much heat does the automatic movement generate when worn all day?

The Seiko NH35 automatic movement produces no perceptible heat on the wrist; it runs solely on kinetic energy from arm motion.

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