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Montblanc Iced Sea 0 Oxygen Deep 4810 Has Water Resistance Equal to Mont Blanc’s Height

Montblanc Iced Sea 0 Oxygen Deep 4810

Montblanc have several design styles and technological advancements that they’ve returned to quite frequently in the last two years. I’m specifically talking about their 1858 Iced Sea dive watches and Geosphere Chronograph 0 Oxygen, the two of which have now been combined for the first time in a new watch. The new piece is called the Montblanc Iced Sea 0 Oxygen Deep 4810 and I am not being hyperbolic when I say it could be the coolest Montblanc watch to date.

Let’s start with the case. It measures 43mm in diameter and is made from titanium, giving it the unmistakable identity of a large tool watch. It’s very thick too at 19.4mm from crystal to caseback so if you’re wearing this watch, there’s no hiding it. Usually, I’d make a comment about how that’s too large for most people to wear (and it is) but in this case I think it’s understandable because of the case’s other features – namely the fact it has an incredible 4,810m water resistance rating.

Montblanc Iced Sea 0 Oxygen Deep 4810

To put that unusual rating in context, that’s the same height as the Mont Blanc, the mountain from which the brand gets its name, but in a downward direction instead of up. It’s incredibly thematic and helps to explain the size of the watch because one of the fundamentals of better pressure resistance is to have stronger, thicker walls. The water resistance isn’t the only interesting thing about the case either because it also contains zero oxygen.

It might sound odd but saying that the case contains zero oxygen means exactly what you think it does. There is no oxygen inside the case – I don’t know how they remove the oxygen but this is what Montblanc tell us. The effect of this is that there is no possibility of the movement’s parts becoming oxidised, increasing the longevity of the calibre. Additionally, there’s no worry of the watch fogging up due to extreme changes in temperature or pressure. Fog is simply water vapour and there can’t be any water without oxygen because as we all know, water is H2O. It’s a cool feature to talk about but realistically the benefits won’t be noticeable day to day.

Montblanc Iced Sea 0 Oxygen Deep 4810

What is noticeable day to day is the dial and caseback. The dial is actually one of the must subtle renditions of the of the Iced Sea so far, presented in a nice aquatic navy blue. It still features the characteristic glacier markings that add a cool icy pattern but it’s less out there than previous green, white or bright blue editions. However, having a relatively simple dial makes sense because it’s balanced out by the very striking caseback.

Montblanc Iced Sea 0 Oxygen Deep 4810

It’s made from titanium with a 3D laser colour engraving that depicts ice when seen underwater. Montblanc describe the technique as “laser-generated oxidization that structures the metal with both matte and shiny finishes to create contrasts of colour and texture.” The result is pretty spectacular, a mesmerising swirl of blues and blacks with a sense of real depth to it. You can imagine the sunlight passing through glassy slabs of ice floating above your head as you dive beneath.

Powering the Montblanc Iced Sea 0 Oxygen Deep 4810 is the manufacture calibre MB 29.29, an automatic movement with a 120-hour power reserve. On top of that impressive power reserve, it’s COSC chronometer certified, ensuring a high level of accuracy in multiple positions. A large part of Montblanc’s horological prowess comes from the fact they bought Minerva a highly celebrated watchmaking brand with a heritage dating back to the early 20th century.

Montblanc Iced Sea 0 Oxygen Deep 4810

I really like the Iced Sea 0 Oxygen Deep 4810. Aesthetically I’ve always thought the Iced Sea has a lot of potential and here we see that potential being matched on the technical side as well. The impressive water resistance, the cool zero oxygen case and the visually stunning caseback produced with laser technology are all fantastic. They also justify the £7,900 price tag.

Price and Specs:

Model: Montblanc Iced Sea 0 Oxygen Deep 4810
Ref: 133268
Case: 43mm diameter x 19.4mm thickness, titanium
Dial: Blue Sfumato glacier pattern
Water resistance: 4,810m (481 bar)
Movement: Montblanc calibre MB 29.29, automatic, 21 jewels, COSC-certified
Frequency: 28,800 vph (4 Hz)
Power reserve: 120h
Functions: Hours, minutes, seconds
Strap: Stainless steel bracelet with additional black rubber strap
Price: £7,900

More details at Montblanc.

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About the author

Michael Sonsino

As Digital Editor for Oracle Time, Michael needs an eye for detail, which makes it a good thing that his twin joys in life are miniatures and watches. He's a lifelong fan of fine timepieces, especially those of a more historic nature - if it has a twist of Art Deco, all the better. Recent purchase: Seiko Prospex 1959 Alpinist Modern Re-Interpretation. Grail watch: Vacheron Constantin Historiques American 1921.