Chronoswiss

Opus Chronograph

Reference Number :

CH-7543.1S-BLSI

Series : Sirius

Retail: $15,620

(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 TakeForget subtle hints of mechanics; the Opus Chronograph throws the doors wide open, inviting you to witness the heart beating within. It's like Chronoswiss decided a traditional dial was just too much clothing for such a beautifully engineered movement. The skeletonization isn't just functional; it's the main event, a filigree of bridges and gears rendered in stark relief against those striking galvanic blue and silver subdial rings. You get the full visual drama – the spinning rotor, the oscillating balance, the intricate dance of the chronograph levers – all framed by a solid 41mm steel case that means business. Those Breguet Losange hands add a touch of classicism, a refined counterpoint to the high-tech exposure below. Strapped on with that plush alligator leather, it’s a statement piece that screams confidence and a deep appreciation for how things work, not just that they work. It’s less a watch, more a wearable piece of kinetic art with a serious engine under the non-existent hood.

DescriptionExecuting the complex architecture of the Opus Chronograph, reference CH-7543.1S-BLSI, begins with a robust stainless steel case measuring 41 mm in diameter and 14.8 mm in height. This housing incorporates a combination of finishes, presenting partly polished surfaces contrasted with areas exhibiting a satin finish across its 38 constituent parts. Securing the assembly is a screw-down case back, featuring a satin finish and incorporating a sapphire crystal for viewing the internal mechanics. The front is protected by a curved, non-reflecting sapphire crystal, held in place by a polished screw-down bezel characterized by side knurling and a full thread design, ensuring structural integrity and water resistance rated at 10 bar, equivalent to 100 meters. Interface points include the winding crown and chronograph pushers, integrated seamlessly into the case profile. Complementing the case is a hand-sewn Louisiana alligator leather strap with a 21 mm band width, fastened securely using a stainless steel folding clasp designed for comfort and ease of use.

Powering the timekeeping and chronograph functions is the Caliber C. 741 S, an automatic movement extensively skeletonized to reveal its intricate workings. Operating at a frequency of 4 Hz, or 28,800 alternations per hour (A/h), this mechanism offers an approximate power reserve of 48 hours when fully wound. Its construction utilizes 25 jewels to minimize friction and enhance durability. Significant finishing details are evident throughout the movement; the skeletonized rotor features a blue Chemical Vapor Deposition (CVD) plating, Côtes de Genève decoration, and employs a ball bearing system for efficient winding. Additional finishing includes polished pallet levers, escape wheels, and screws, while the bridges and base plate are adorned with perlage. The dial itself is a galvanic blue and silver structure, meticulously skeletonized to achieve mechanical clarity. Time and chronograph data are presented via central hour and minute hands, a small seconds subdial, a central chronograph seconds hand, a 30-minute counter, a 12-hour counter, and an analog date display. The hands are lacquered, curved "Breguet Losange" style, with the minute hand uniquely bent by hand.

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