Breguet Marine GMT 5857ST: Classical Horology in a Modern Sports Case
The intersection of high-grade haute horlogerie and practical daily utility is a domain naturally occupied by Breguet. Within the contemporary sports segment, the reference 5857ST/12/SZ0 offers travelers a sophisticated dual-time complication housed in a 42 mm stainless steel case. It maintains the foundational decorative codes established by the manufacture while delivering modern robustness and water resistance.
- Reference
- 5857ST/12/SZ0
- Case size, mm
- 42
- Case
- Steel
- Dial
- Silver
- Movement
- Automatic
- Calibre
- Breguet 517F
- Power reserve
- 72 hours
- Water resistance
- 100m
- Strap
- Bracelet
- Condition
- Perfect
- Set
- Papers
The Marine GMT within the Collection
The Marine GMT occupies a unique role within the modern catalogue of the manufacture. While traditional dress watches remain firmly anchored in the Classique family, the Marine line adapts historic maritime timekeeping for active everyday wear. The reference 5857ST bridges these two worlds by combining mechanical travel functionality with a full stainless steel case and integrated bracelet structure.
Unlike standard three-hand iterations or specialized diving chronographs, the GMT model prioritizes the dual indication of time zones without compromising on traditional engine-turned decorations. With a case engineered to withstand water pressure to a depth of 100 meters, it represents a versatile expression of fine watchmaking built for modern global travel.
Maritime Heritage and Chronometric Origins
The technical foundation of the line dates back to 1815, when Abraham-Louis Breguet was appointed official chronometer maker to the French Royal Navy by King Louis XVIII. During this era, marine chronometers served as vital navigational instruments, essential for calculating longitude at sea. Their construction required maximum accuracy and resistance to the constant motion and damp environment of shipboard life.
Modern interpretations translate these historic instruments into wrist-worn dimensions. While contemporary construction standards add structural stability, the visual identity retains core naval signatures. Elements such as hand-engraved engine-turned dials, fluted casebands, and blued steel hands directly echo the aesthetic parameters established in the manufacture's early nineteenth-century workshops.
Case Architecture and Dial Craftsmanship
Measuring 42 mm in diameter, the stainless steel case exhibits meticulous hand-finishing across all surfaces. The caseband features classical coin-edge fluting worked directly into the steel wall, flanked by a screw-down crown with integrated protective shoulders. Threaded pins secure the solid strap attachment points to the lugs, reinforcing structural security during active wear.
The dial is crafted from silvered gold and decorated with hand-applied guilloché patterns that serve to visually organize its functional sub-displays. A traditional Roman numeral chapter ring dominates the main hour track, traversed by blued steel Breguet hands with open-tipped pommes. The secondary time zone is presented on an off-center subdial at the lower portion of the layout, complete with an integrated date aperture at 6 o'clock, while a dedicated 24-hour day and night indicator resides at 2 o'clock.
The Calibre 517F Engine
Powering the reference is the self-winding Breguet calibre 517F, an in-house movement specifically developed to drive multi-time zone indications reliably. Operating at a frequency of 28,800 vibrations per hour, the movement provides a power reserve of approximately 65 to 72 hours. To enhance mechanical stability against magnetic interference and temperature variations, the regulating organ features an inverted in-line lever escapement with silicon horns and a silicon balance spring.
Visible through the sapphire crystal display back, the finishing adheres to haute horlogerie standards. The self-winding system relies on a heavy 18-carat gold oscillating weight, fully decorated with hand-engraved engine-turned wave patterns. Bridges are meticulously finished with Geneva stripes, polished bevels, and circular graining on the mainplate.
Proportions and Bracelet Ergonomics
Despite its substantial 42 mm diameter and robust construction, the watch wears with exceptional balance. The short, downward-curving lugs allow the integrated stainless steel bracelet to wrap comfortably around a variety of wrist sizes. The bracelet links feature alternating brushed and polished surfaces, equipped with a concealed steel folding clasp that maintains a sleek profile on the underside of the wrist.
The combination of luminescent dots along the outer minute track, bold Roman numerals, and high-contrast blued hands ensures optimal legibility in all lighting conditions. The logical arrangement of the primary and secondary time zone displays allows the wearer to read two distinct times at a single glance, making it a highly ergonomic choice for transcontinental travel.
Condition and Accompanying Set
This particular Marine GMT is presented in pristine, like-new condition. The stainless steel case retains its original factory geometry, with crisp hand-fluted details along the caseband and unblemished polished surfaces on the bezel and bracelet links.
The timepiece is offered complete with its original box and papers. It has undergone rigorous technical inspection by our watchmakers to verify timekeeping accuracy, water resistance, and structural integrity, offering an exemplary representative of Breguet's nautical tradition.
See the Breguet Marine GMT at WATCH LAB — price, photos and availability in our Dubai boutique.