The Montblanc Iced Sea 0 Oxygen Deep 4810 is an oversized titanium dive watch with a manufacturer-stated water resistance of 4,810 metres, a COSC-certified automatic movement and a glacier-inspired blue dial. Those are Montblanc’s published specifications and design claims; they are not independent test results. The exact model is reference MB135634.
What is the Montblanc Iced Sea 0 Oxygen Deep 4810?
Montblanc introduced the watch in connection with Watches and Wonders 2024; the brand’s video description dates its unveiling to April 9, 2024. Its central idea links the mountain in the company name with the sea: Montblanc frames the 4,810-metre rating as an inversion of Mont Blanc’s height. That is brand storytelling, while the depth figure itself is a published product specification.
The case is titanium, measuring 43 mm across and 19.4 mm high, according to Montblanc. The diameter is substantial, and the height is considerable for a wristwatch. Those figures are useful for assessing whether the watch may suit your wrist and how it could sit beneath a cuff, but they cannot establish comfort; no wrist-fit assessment is available here.
What gives the 4810 its glacier look?
Montblanc describes the dial as a blue sfumato glacier pattern inspired by the Mer de Glace. The brand says its textured surface is made using the ancestral gratté-boisé technique. On the back, a three-dimensional engraving depicts a diver’s view beneath the ice, according to Montblanc.
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- Stainless Steel case with Black Resin Band
- Black Dial with date window at 3 O'clock
- Luminous markers and hour hands; sweep second hand
- Anti-reverse bezel
- Water-resistant to 200 M (660 feet)
The dial and case-back imagery make the alpine-and-underwater theme central to the watch, rather than relying on the depth rating alone. These are descriptions of the design; they do not establish independent assessments of legibility, lume performance or finishing.
Movement, functions and published dive specifications
Montblanc specifies its automatic MB 29.29 manufacture movement, certified by COSC, with approximately five days of power reserve. The listed functions are hours, minutes, seconds and date. The reserve is approximate, as stated by the manufacturer.
Rank #2
- The waterproof level of this watch has reached 10 ATM waterproof, which can work normally at a depth of 100 meters (330ft) underwater. It is not only suitable for wearing in water activities such as swimming, diving, snorkeling, surfing, rowing, water skiing, but also suitable for wearing in daily life and outdoor sports, such as jogging, hiking, climbing, cycling, etc.
- The built-in stopwatch and timer function of the watch can meet the precise timing needs of exercise and sports competitions.
- The dual time zone display function will make your trips more convenient; 12/24 hour format display can meet the time reading habits of different people.
- Support multiple useful functions, such as: alarm clock, hourly chime, calendar and back light.
- The watch battery is replaceable. If you find that the watch is not working or the text on the display is not clear, please replace the watch battery in time.
Montblanc lists water resistance of 4,810 metres and pressure resistance of 481 bar, and says the watch conforms to ISO 6425 for scuba diving. These are manufacturer-published specifications and a manufacturer claim about the standard; no independent pressure test or certification review is established here. The rating should not be treated as independent evidence of performance in real-world diving conditions.
How much does reference MB135634 cost?
| Region | Montblanc listed price | Source and timing |
|---|---|---|
| United States | $10,300 | Montblanc US product listing accessed in 2026 |
| United Kingdom | £8,400 | Montblanc UK product listing accessed in 2026 |
These are regional listed prices on Montblanc’s official product pages, accessed in 2026, and may change. Check the listing for your region for the current price and availability. The two figures are local prices, not a currency-converted comparison.
Rank #3
- 330 ft. (100 M) water resistance. In general, suitable for recreational surfing, swimming, snorkeling, sailing and water sports.
- 12/24-hour timekeeping, 43 mm resin case with mineral dial window, Japanese quartz movement; Analog: 3 hands (hour, minute, second)
- Case / bezel material: Resin; Rotating bezel
- Day and date display at 3 o’clock
- Analog display, molded resin band with buckle closure; Accuracy: ±20 seconds per month
What does “0 Oxygen” mean for this model?
The available model-specific product specifications identify MB135634 as the Iced Sea 0 Oxygen Deep 4810, but do not explain the technology’s construction or establish a separate performance benefit. Montblanc’s collection page says an existing Iced Sea timepiece can be upgraded with Zero Oxygen technology during service at a Montblanc boutique. It does not establish whether MB135634 qualifies for a particular upgrade, or specify its cost, timing, geographic availability or terms. Ask Montblanc to confirm model-specific eligibility before relying on an upgrade option.
Quick Recap
Best Value
- Iconic Promaster watches with advanced functions designed to venture to the deepest depths.
- 3 Hand, Date
- Silver-Tone Stainless Steel
- Luminous Hands and Markers and Mineral Crystal
- Sustainably powered by any light, with our Eco-Drive technology this watch never needs a battery. ISO Certified, 200M Water Resistant and 5 Year Limited Warranty
Rank #4
- DIVER-INSPIRED DESIGN — Inspired by the sea, the MDV-106B is styled after classic dive watches and delivers 200-meter water resistance at an unbeatable price point. The black resin band and stainless steel case give it a classic look, while the anti-reverse rotary bezel adds authentic dive-watch character.
- STAINLESS STEEL CASE WITH SCREW-LOCK CROWN & CASEBACK — The MDV-106B features a stainless steel case and a reliable screw-lock crown for enhanced water resistance protection. Screw-down crown and screw-lock caseback work together to keep the movement sealed and secure during water activities — a construction standard found on dive watches far above this price range.
- LARGE FLUORESCENT HANDS & INDICES FOR INSTANT READABILITY — The dial features hands and hour indices with large fluorescent areas for easy reading in low-light and underwater conditions. The clean 3-hand analog layout with date display at 3 o'clock keeps the dial uncluttered and immediately legible at a glance.
- 44MM STAINLESS STEEL CASE | 22MM LUG WIDTH | MINERAL GLASS — The case measures 44mm in diameter, 12mm in height, with a 49mm lug-to-lug length and a standard 22mm lug width — making strap upgrades effortless with a vast range of aftermarket options. Mineral glass protects the dial from everyday scratches and impacts.
- 3-YEAR BATTERY & 200M WATER RESISTANCE — Powered by an SR626SW battery with an approximate 3-year life, the case measures 49.5 × 46.3 × 12.1mm and weighs 92 grams. At 200 meters of water resistance, the Duro is versatile and suitable for all situations — whether in the water, hiking, running, or at the office.
What to know before buying
- Assess the dimensions: use the published 43 mm diameter and 19.4 mm height as fit considerations, rather than assuming titanium makes the watch small or slim.
- Separate specification from proof: Montblanc publishes the water-resistance and pressure figures and says the watch conforms to ISO 6425; independent dive testing is not established.
- Verify local details: regional prices and availability can change, so consult Montblanc’s listing for reference MB135634 in your country.
- Ask about service directly: the collection-level upgrade information does not settle eligibility or terms for this reference.
Official product details
- Montblanc US product page for MB135634
- Montblanc UK product page for MB135634
- Montblanc Iced Sea collection and Zero Oxygen service information
- Montblanc’s April 9, 2024 video description
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.
