Chronoswiss

Opus Chronograph

Reference Number :

CH-7543.1S-BLSI/71-2

Series : Sirius

Retail: $15,070

(As of: 04/2025)

This watch is not for sale, this page is just for reference purposes only. If you would like to purchase this watch, please contact Chronoswiss. If you are interested in selling this watch to us, you can contact us here.

Quick TakeOkay, let's talk about the Opus Chronograph. It’s like Chronoswiss decided to x-ray a high-performance engine and then wear it on their wrist. The skeletonization isn't just partial; it's a full-on structural dissection, leaving this filigree framework where a dial used to be. Yet, it’s completely legible! Those galvanic blue and silver subdial rings pop against the mechanical maze behind them, guiding your eye exactly where it needs to go for the time, date, or chronograph readings. You see the gears turning, the levers moving – it’s pure mechanical theater powered by the C. 741 S automatic caliber. The "Breguet Losange" hands add a touch of classical elegance that contrasts beautifully with the modern, almost industrial feel of the openworked design. Fastened with a practical rubber strap and folding clasp, and built tough with 100m water resistance and that sturdy 41mm steel case, it’s not just a showpiece. It's a wearable piece of intricate engineering, a conversation starter that reveals more complexity the closer you look. It’s a watch for someone who appreciates how things work as much as the final product.

DescriptionEngineered from stainless steel, the case of reference CH-7543.1S-BLSI/71-2 presents a diameter measuring 41 millimeters and a vertical height of 12.7 millimeters. Its construction incorporates a mixed finish, exhibiting both polished and satin-finished surfaces across its structure. A key element is the polished screw-down bezel, distinguished by side knurling and a full thread design, securing a curved sapphire crystal treated with an anti-reflective coating. Complementing the front crystal, the screw-down case back also features a sapphire crystal window, allowing visual access to the internal mechanism, and possesses a satin finish. The interface point for the strap measures 21 millimeters in width. Functional integrity under pressure is rated to 10 bar, equivalent to a water depth of 100 meters, ensuring resilience against water ingress during typical aquatic activities. The case itself is assembled from 23 distinct parts, indicating a detailed construction methodology aimed at both aesthetic precision and functional robustness.

Powering this timepiece is the Caliber C. 741 S, an automatic movement meticulously skeletonized to reveal its intricate workings. Operating at a frequency of 4 Hertz, which translates to 28,800 alternations per hour, the movement provides a power reserve of approximately 48 hours when fully wound. Its architecture is built upon 25 jewels to minimize friction and enhance longevity. The finishing details are elaborate: the rotor is skeletonized, CVD-plated in blue, decorated with Côtes de Genève, and mounted on a ball bearing system for winding efficiency. Further embellishments include a polished pallet lever, escape wheel, and screws, while the bridges and base plate showcase perlage finishing. The dial material itself is a skeletonized structure with galvanic blue and silver treatments defining the subdial perimeters. Time and chronograph functions are clearly displayed via central hours and minutes, a small seconds subdial, central chronograph seconds, a 30-minute counter, a 12-hour counter, and an analog date indication. The hands feature a "Breguet Losange" shape, are lacquered and curved, with the minute hand specifically bent by hand to follow the crystal's curvature. The watch is secured to the wrist by a rubber strap equipped with a folding clasp mechanism.

GenderMen

SignaturesChronoswiss

Country of OriginSwitzerland

Case Size41 mm

MovementAutomatic

CaliberC. 741 S

FunctionsChronograph, Hours, Minutes, Seconds, Date

Power Reserve48 Hours

Case MaterialsStainless Steel

Bezel MaterialsStainless Steel

Lug MaterialsStainless Steel

Case BackSapphire Crystal