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The Montblanc Iced Sea 0 Oxygen Deep 4810 is a 43 mm titanium dive watch rated by Montblanc to 4,810 metres (481 bar). Its reference is MB135634, and the brand lists a U.S. price of $10,300 and a U.K. price of £8,400. Despite “New Release” in the original title, Montblanc’s own video dates the unveiling to Watches and Wonders 2024—not 2026.
What is the Montblanc Iced Sea 0 Oxygen Deep 4810?
It is the most extreme-rated model in Montblanc’s Iced Sea dive-watch family: a titanium-cased, automatic watch whose name combines its zero-oxygen case concept with a maker-stated 4,810-metre water-resistance rating. Montblanc places the Iced Sea collection in the setting of the Mer de Glace glacier. The Deep 4810 is distinct from the collection’s less expensive Iced Sea Automatic Date models; their specifications should not be assumed to match this watch. Montblanc’s Iced Sea collection page shows the broader range.
Specifications
| Specification | Montblanc listing |
|---|---|
| Reference | MB135634 |
| Case | Titanium; 43 mm diameter; 19.4 mm height |
| Dial | Blue sfumato glacier pattern, with gratté-boisé texture |
| Bezel and crown | Unidirectional rotating bezel; screw-down titanium crown with protective shield |
| Movement | Montblanc manufacture automatic MB 29.29, described by Montblanc as COSC-certified |
| Functions | Hours, minutes, seconds and disc date |
| Power reserve | Approximately five days, according to Montblanc |
| Water resistance | 4,810 m / 481 bar, according to Montblanc; the brand also says it conforms to ISO 6425 |
These are manufacturer-published specifications, not independent measurements. Montblanc’s U.S. product listing identifies the reference and specifications.
What does “0 Oxygen” mean here?
“0 Oxygen” identifies the watch’s oxygen-devoid case concept; it is part of the model’s name and construction story, not a separate water-resistance unit. The performance figure Montblanc publishes is 4,810 metres, equivalent to 481 bar. The brand states that the watch conforms to ISO 6425, but the product page is not an independent laboratory report or a standards-body test certificate. The rating should therefore be read as Montblanc’s specification rather than independently verified real-world performance.
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#1 Best Overall
- MontBlanc 4810 Automatic Men's Watch 114854
Dial and caseback design
Montblanc says the blue glacier-pattern dial takes inspiration from the Mer de Glace and uses a gratté-boisé process for its textured finish. The caseback carries a three-dimensional underwater-ice scene. Together, these details connect the watch visually to the glacier theme rather than relying on the depth rating alone.
How much does it cost?
When the official listings were checked in 2026, Montblanc showed $10,300 on its U.S. page and £8,400 on its U.K. page. These are separate regional listing prices, not a currency conversion or a tax-adjusted comparison; prices and stock can change. Check the relevant local page for current information: U.S. listing and U.K. listing.
Rank #2
- 42 mm stainless steel case
- Silver-tone dial with date window
- Black leather strap
- Swiss Automatic movement
- Guaranteed 100% Authentic
When was the Iced Sea 0 Oxygen Deep 4810 released?
Montblanc’s official video description says the watch was unveiled in connection with Watches and Wonders 2024. It is therefore not a 2026 debut, even if a current listing or article headline describes it as a new release. Montblanc’s launch video supplies that unveiling context.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Who is this watch for?
The Deep 4810 is aimed at buyers drawn to a large titanium dive watch, the zero-oxygen case concept and the glacier-inspired execution. Its 43 mm diameter and 19.4 mm height are substantial dimensions, so those figures matter more to everyday wear than the headline depth rating for most owners. The 4,810-metre rating does not make it necessary for ordinary recreational diving; no independent practical dive test or wrist-fit assessment is established here.
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- Montblanc 4810 Automatic Black Dial Men's Watch 115935
For a purchase, use the regional Montblanc product page or an authorized luxury-watch retailer, and verify the reference MB135634, current price and seller before ordering. No marketplace availability is established by the manufacturer listing.
Quick Recap
Best Value
- VERIFY YOUR WATCH MODEL & MEASURE THE CORRECT SIZE USING A RULER – Watch Parts Are Model and Size Specific. Please Verify Compatibility Before Purchasing.
- Compatibility & Size: 22mm Leather Watch Strap Band, compatible with Montblanc 4810 Timewalker Automatic (Black WS).
- Ensure Perfect Fit: Verify the size, color, and model compatibility with your specific watch before purchasing to ensure a perfect fit and avoid returns or exchanges.
- Compatibility Check: Double-check your watch's requirements and compatibility details to ensure the product meets your needs. This will help you avoid any issues with returns or exchanges.
- Aftermarket Product: This is an aftermarket/generic made to original factory specs for a precise fit.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
