The Longines Ultra-Chron Carbon: A Stealthy Modern Makeover for a Resurrected Classic

Longines has introduced the Ultra-Chron Carbon, a modern reinterpretation of its iconic late-1960s model. This latest release is noteworthy for its use of forged carbon—a first for the brand. Combining vintage-inspired design elements with cutting-edge materials and technology, the Ultra-Chron Carbon stands as a compelling entry in the high-performance sports watch segment. Here’s an in-depth look at the features, specifications, and innovations that define this new model.

A Brief History of the Ultra-Chron

The Longines Ultra-Chron was first introduced in 1968, setting itself apart as a pioneer in high-frequency watchmaking. The name “Ultra-Chron” is derived from its ultra-high frequency movement, designed to improve accuracy and resistance to external shocks. In 2022, Longines revived the Ultra-Chron, staying faithful to its original design while incorporating modern advancements. The 2025 Ultra-Chron Carbon builds on this legacy, introducing an entirely new case material and aesthetic.

Key Features of the Longines Ultra-Chron Carbon

1. Case Material and Design

   – The 43mm case of the Ultra-Chron Carbon is crafted from forged carbon, a composite material formed by compressing carbon fibers and epoxy resin. This process results in a unique pattern for each case, ensuring no two watches are exactly alike.

   – The material significantly reduces the weight of the watch, with the Ultra-Chron Carbon weighing just 80 grams, including the strap. In comparison, its steel counterpart weighs 172 grams.

   – Complementing the carbon case are a fixed titanium bezel and a titanium caseback, both finished in a matte texture. The bezel features an engraved aluminum insert marked with ten-minute intervals, contributing to the watch’s monochromatic and modern aesthetic.

2. Dial and Hands

   – The anthracite dial is sandblasted to achieve a matte finish, enhancing the watch’s stealthy appearance.

   – The hands and applied indexes are treated with grey PVD coating and filled with blue Super-LumiNova for optimal legibility in low-light conditions.

   – The design emphasizes minimalism and functionality, aligning with the watch’s utilitarian ethos.

3. High-Frequency Movement

   – At the heart of the Ultra-Chron Carbon is the Longines caliber L836.6, a high-frequency automatic movement exclusive to the brand. Operating at 5 Hz (36,000 vibrations per hour), this movement offers improved resistance to shocks and positional variations compared to standard 4 Hz movements.

   – The movement features a silicon balance spring and antimagnetic components, enhancing its durability and reliability.

   – The watch is chronometer-certified by TIMELAB, an independent testing facility in Geneva. Unlike traditional chronometer certifications that focus solely on the movement, TIMELAB tests the entire assembled watch over a 15-day period under varying temperatures and conditions.

4. Water Resistance and Durability

   – The Ultra-Chron Carbon is water-resistant up to 300 meters, making it suitable for professional diving and other aquatic activities.

   – The screw-down crown and caseback, both made of titanium, contribute to the watch’s robust construction and reliability in extreme conditions.

5. Strap and Wearability

   – The watch comes with a 22mm black technical fabric strap equipped with a titanium buckle. This strap not only complements the watch’s modern aesthetic but also ensures comfort and durability.

   – Despite its large dimensions (43mm diameter and 14mm thickness), the reduced weight and short lug design enhance its wearability for a range of wrist sizes.

A Closer Look at the Movement

The Longines caliber L836.6 is a testament to the brand’s commitment to innovation. High-frequency movements, like this one, are designed to provide smoother motion of the seconds hand and greater precision. The silicon balance spring is a key feature, offering resistance to magnetic fields and temperature variations. The movement has a power reserve of 52 hours, ensuring reliable performance even after being unworn for a couple of days.

Monochromatic Design and Practicality

The Ultra-Chron Carbon’s monochromatic design distinguishes it from its vintage-inspired steel counterpart. The subdued color palette, dominated by matte finishes and grey tones, creates a contemporary and tactical appearance. While the fixed bezel differs from the rotating bezel found on the steel model, it aligns with the minimalist design philosophy of this release.

Certification and Testing

The TIMELAB certification process sets the Ultra-Chron Carbon apart from many of its competitors. During the 15-day testing period, the watch undergoes rigorous assessments of its accuracy and performance under various conditions. This certification ensures that the Ultra-Chron Carbon meets the highest standards of precision and durability.

Pricing and Availability

The Longines Ultra-Chron Carbon is priced at $4,900 and is available through authorized retailers and the Longines website. Unlike many limited-edition releases, the Ultra-Chron Carbon is a standard production model, making it more accessible to enthusiasts and collectors.

Technical Specifications

– Brand: Longines

– Model: Ultra-Chron Carbon

– Reference Number: L2.839.4.52.2

– Case Material: Forged carbon

– Diameter: 43mm

– Thickness: 14mm

– Dial Color: Anthracite

– Indexes: Applied

– Lume: Blue Super-LumiNova

– Water Resistance: 300 meters

– Strap: Black technical fabric with titanium clasp

Movement Details:

– Caliber: L836.6

– Functions: Hours, minutes, seconds

– Frequency: 5 Hz (36,000 VpH)

– Power Reserve: 52 hours

– Chronometer Certification: TIMELAB

Conclusion

The Longines Ultra-Chron Carbon is a bold addition to the brand’s lineup, blending vintage-inspired design with modern materials and technology. Its lightweight construction, high-frequency movement, and stealthy aesthetic make it a versatile choice for enthusiasts seeking a contemporary sports watch with a rich heritage. As Longines continues to innovate within the Swatch Group portfolio, the Ultra-Chron Carbon exemplifies the brand’s ability to balance tradition with modernity.

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