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Longines Ultra-Chron Carbon

L2.839.4.52.2

The Longines Ultra-Chron Carbon is a 43 mm carbon dive watch with an L836.6 automatic movement.

All Longines watchesDiver watchesLightweightLightest, ranked
Price
$4,900
Material
Carbon
Grade / type
Carbon fibre composite
Weight
80 g (head only)
Water resistance
300 m
Reference
L2.839.4.52.2
Type
Diver
Case diameter
43.0 mm
Origin
Switzerland
Movement
High-frequency automatic (5Hz)
Caliber
L836.6
Power reserve
52 hours
Complications
Date
Colour
Black
Construction
Assembled
Finish technology
Natural finish
Caseback
Titanium
Nickel-free
Unconfirmed (clasp or buckle material not confirmed)
Bracelet / strap
Rubber strap; titanium crown and caseback
Crystal
Sapphire
Display back
No
Dial
Black cushion dial
Dial colours
Black
Lume
Super-LumiNova
Availability
Offered
Status
Current
Not published
Thickness, Lug-to-lug, Hardness, Surface treatment, Matching bracelet
Medium confidence Verified Jul 2026 Source: Longines (maker product page) / Longines Ultra-Chron (maker) / SJX
Facts are free to cite with a link.
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Frequently asked questions

What is the case of the Longines Ultra-Chron Carbon made of?

The case is carbon fibre composite. The guide has not yet confirmed it on the maker's own page. The caseback is titanium.

What size is the Longines Ultra-Chron Carbon?

The case is 43 mm across. It is water resistant to 300 m.

How much does the Longines Ultra-Chron Carbon weigh?

About 80 g for the watch head alone.

How much does the Longines Ultra-Chron Carbon cost, and is it available?

It is in production, at a list price of $4,900.

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