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The Longines Ultra-Chron Carbon is the brand’s first watch with a carbon case, according to Longines. Reference L2.839.4.52.2 pairs a 43 mm carbon-and-titanium construction with the Ultra-Chron line’s high-frequency automatic movement, rated by Longines at 36,000 vibrations per hour. It takes its cushion-shaped design cues from the 1968 Ultra-Chron Diver, while introducing carbon to a Longines watch case for the first time.
What makes the Ultra-Chron Carbon a first for Longines?
The “first” refers specifically to the case material: Longines says this is the first watch case in its history made using carbon. The claim does not mean the first carbon watch ever made, nor the first Ultra-Chron. The brand’s 2025 announcement describes carbon as a material being used for the first time in a Longines watch case. Longines’ announcement
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Longines says the 43 mm case is formed from strips of unidirectional carbon fibre and epoxy resin. The strips are placed in a mould, heated and compressed under high pressure, then cold-cut, according to the brand’s press kit. Longines describes carbon as strong and light and notes its use in fields such as aeronautics; those are manufacturer descriptions, not independent measurements of this watch’s weight, strength or durability. 2025 Ultra-Chron Carbon press kit
How does it connect to the 1968 Ultra-Chron Diver?
The Carbon model carries forward the cushion-shaped case and design language of the Ultra-Chron Diver, which Longines traces to 1968. Longines calls that earlier diver the first dive watch equipped with a high-frequency movement. This is the historical lineage Longines claims; it does not make the new model a specification-for-specification reissue of the 1968 watch. Longines’ 2025 announcement and Longines’ Ultra-Chron heritage page
#1 Best Overall
- Automatic L687 movement, hours, minutes, small seconds with 24 hours indicator at 9 o'clock. date indicated by the half moon central hand. Moon phase display at 6 o'clock. Case, hours, minutes, small seconds with 24 hours indicator at 9 o'clock. date indicated by the half moon central hand. Chronograph mechanism : central 60 seconds hand, moon phase display with 12 hours counter at 6 o'clock, 30 minutes counter with day and month display at 12 o'clock. Transparent case back with sapphire crystal
- Stainless steel with triple safety folding clasp and push-piece opening mechanism
- 5 Year International Warranty
Longines Ultra-Chron Carbon specifications
These are manufacturer-listed specifications for reference L2.839.4.52.2, rather than independent test results. The product page lists the watch in Longines’ current US collection. Longines US product listing
| Specification | Longines listing |
|---|---|
| Reference | L2.839.4.52.2 |
| Case | 43 mm; carbon and titanium |
| Movement | Self-winding mechanical; 36,000 vibrations per hour |
| Balance-spring | Monocrystalline silicon |
| Power reserve | Up to 52 hours |
| Chronometer certification | Longines says each watch is fully chronometer-certified by TIMELAB |
| Water resistance | 30 bar |
| Crystal | Sapphire with anti-reflective coating on both sides |
| Dial | Anthracite with Swiss Super-LumiNova |
| Strap and buckle | Nylon strap with titanium buckle |
| Crown | Screw-in |
The high-frequency movement is central to the Ultra-Chron identity, while the silicon balance-spring and stated reserve are distinct specification details. The certification entry reports Longines’ claim about TIMELAB certification; it is not a separate accuracy measurement for this article. The 30-bar rating is the maker’s specification and should not, by itself, be treated as personal advice about using the watch for diving.
Rank #2
- Automatic L844 movement, hours, minutes, seconds and date. 24 hours hand with time zone mechanism
- Beige Leather strap with double security folding clasp with micro adjustment system
- 5 Year International Warranty
How much does the Longines Ultra-Chron Carbon cost?
On October 8, 2026, Longines’ US product page listed reference L2.839.4.52.2 at $5,550 and stated a five-year warranty. The Longines UK listing showed £4,550. These are regional listing prices, not a guarantee of current pricing or availability; check the local Longines page and warranty terms before buying. US listing and UK listing
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the first does—and does not—tell you
The distinction Longines is making is material-specific: carbon appears in a Longines watch case for the first time, while the watch retains the Ultra-Chron family’s high-frequency identity and references the 1968 diver’s shape. Longines’ published specifications establish the movement frequency, reserve, materials and other listed features, but do not establish independent results for accuracy, wear comfort, weight, durability or water performance.
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Quick Recap
Rank #4
- Automatic L movement, hours, minutes, seconds. Screw-down case back
- Stainless steel with double security folding clasp with micro adjustment system
- 5 Year International Warranty
Rank #3
- Automatic L687 movement, hours, minutes, small seconds with 24 hours indicator at 9 o'clock. date indicated by the half moon central hand. Moon phase display at 6 o'clock. Case, hours, minutes, small seconds with 24 hours indicator at 9 o'clock. date indicated by the half moon central hand. Chronograph mechanism : central 60 seconds hand, moon phase display with 12 hours counter at 6 o'clock, 30 minutes counter with day and month display at 12 o'clock. Transparent case back with sapphire crystal
- Stainless steel with triple safety folding clasp and push-piece opening mechanism
- 5 Year International Warranty
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.
