Montblanc Iced Sea 0 Oxygen 38mm: ISO 6425 Dive Watch Gets Compact Upgrade
Montblanc Shrinks the Iced Sea to 38mm While Keeping ISO 6425 Credentials
At Watches and Wonders 2025, Montblanc unveiled a more compact version of its popular Iced Sea dive watch collection. The new Montblanc Iced Sea 0 Oxygen 38mm brings the brand's glacier-inspired aesthetic to a smaller case while maintaining the rigorous ISO 6425 certification that defines a true diver's watch.
According to aBlogtoWatch, the 38mm models debut alongside two new dial options: Glacier White (ref. 134024) and Glacier Blue (ref. 134022). Both feature the intricate gratté-boisé technique, a process that takes four times longer than standard dial production and requires over 30 distinct steps to achieve its textured, ice-like appearance.
What Makes This a True ISO 6425 Dive Watch?
The ISO 6425 standard is the international benchmark for dive watch certification. To earn this designation, a timepiece must meet strict criteria across multiple categories:
| ISO 6425 Requirement | Montblanc Iced Sea 38mm |
|---|---|
| Minimum water resistance | 100m (exceeds minimum) |
| Unidirectional rotating bezel | Yes, with ceramic or aluminum insert |
| Luminous markings | Yes, hands, indexes, and bezel marker |
| Time预set device | Screw-down crown |
| Shock resistance | Montblanc Laboratory Test certified |
The watch also features a distinctive 3D-engraved caseback depicting a scuba diver beneath an iceberg — a signature element of the Iced Sea collection since its 2022 introduction.
0 Oxygen Technology: A First for the Collection
Perhaps the most significant technical advancement in these new 38mm models is the integration of Montblanc's 0 Oxygen technology. This innovation eliminates all oxygen from inside the case, providing two key benefits:
- Prevents fogging during sudden temperature changes
- Protects internal components from oxidation over time
Each watch ships with a certificate verifying the successful implementation of this technology. Montblanc has announced that starting in April 2025, all newly produced Iced Sea models will include 0 Oxygen technology. Existing owners can also upgrade their watches by sending them to a Richemont service center or Montblanc boutique.
Key Specifications
- Case diameter: 38mm
- Thickness: Just over 12mm
- Movement: Montblanc Caliber MB24.17 (based on Sellita SW200)
- Power reserve: 38 hours
- Water resistance: ISO 6425 certified
- Bezel: White ceramic (Glacier White) or anodized aluminum (Glacier Blue)
- Crystal: Domed sapphire with anti-reflective coating
According to Montblanc, each timepiece undergoes the rigorous Montblanc Laboratory Test, ensuring resistance to shocks, magnetic fields, and temperature fluctuations. The MB 24.17 features 26 jewels and operates at 28,800 vibrations per hour.
Pricing and Availability
The Montblanc Iced Sea 0 Oxygen 38mm is available now through authorized dealers worldwide:
- On rubber strap: $3,460 USD
- On stainless steel bracelet: $3,660 USD
For collectors seeking a dive watch that combines luxury finishing with genuine underwater capability, these new 38mm models offer a compelling option that doesn't compromise on technical specifications. The smaller case size should appeal to those who found the original 41mm models too large for comfortable daily wear.
Frequently Asked Questions
What is the difference between ISO 6425 and regular water resistance ratings?
ISO 6425 is a comprehensive international standard specifically for dive watches. It goes beyond simple water resistance testing to include requirements for bezel functionality, legibility in darkness, shock resistance, and magnetic resistance. A watch labeled "200m water resistant" without ISO 6425 certification has not undergone this full suite of dive-specific testing.
Can I upgrade my existing Montblanc Iced Sea with 0 Oxygen technology?
Yes. Montblanc has confirmed that starting in April 2025, owners of previous Iced Sea editions can have 0 Oxygen technology added to their watches by sending them to a Richemont service center or visiting a Montblanc boutique.
Is the 38mm case size suitable for diving?
Absolutely. Despite its more compact dimensions, the 38mm Iced Sea meets all ISO 6425 requirements for a certified diver's watch. The smaller size may actually provide better wrist comfort during extended underwater use.
Related Reading
Learn more about dive watch standards and selection in our comprehensive guide: How to Choose a Dive Watch: ISO 6425 and Beyond.
Source: According to aBlogtoWatch and official Montblanc press materials (March 2025).