Chronoswiss

Sirius Big Date

Reference Number :

CH-3521.1 R

Series : Heritage

Retail: $17,050

(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 TakeThis Sirius Big Date isn't just telling time; it’s whispering tales of traditional craftsmanship wrapped in the warm embrace of 18-karat red gold. That solid sterling silver dial, intricately decorated with guilloche, isn't merely a backdrop – it's a stage. See how the thermally blued Breguet hands dance across it, their elegant curves catching the light just so? And that big date at 12 o'clock? It's bold, unapologetic, making sure you never miss an important moment. Down at 6, the power reserve indicator is like a quiet nod from the engine room, reminding you of the meticulous Caliber C. 351 ticking reliably within. It’s the kind of watch that feels substantial yet refined on the wrist, blending classic design elements like the knurled bezel with the practicalities of automatic winding and decent water resistance. It's less a tool and more a companion, radiating a quiet confidence and an appreciation for the finer details – a true modern classic in the making.

DescriptionThis timepiece utilizes a case constructed from 18-karat red gold, measuring 40 mm in diameter and 10.30 mm in height. The case structure incorporates a partly polished and partly satin finish, providing visual contrast. Attachment points for the strap are configured with a standard 20 mm band width. Security and structural integrity are enhanced by a screw-down case back, which features a satin finish and incorporates a sapphire crystal for viewing the internal mechanism. Complementing the case back is a polished screw-down bezel, distinguished by side knurling for improved grip and a full thread engagement system. The overall design achieves a water resistance rating of 3 bar, equivalent to a depth of 30 meters, offering protection against incidental water exposure. The assembly consists of 21 distinct parts contributing to the external housing and its related components.

Powering the watch is the Caliber C. 351, an automatic movement comprised of 21 jewels. This self-winding mechanism operates at a frequency of 4 Hz, corresponding to 28,800 alternations per hour (A/h), ensuring precise timekeeping. A fully wound mainspring provides an approximate power reserve of 40 hours, the status of which is indicated directly on the dial. The dial itself is fabricated from solid sterling silver (925 alloy) and features intricate guilloche patterning. Functional displays include central indicators for hours, minutes, and seconds. Prominently positioned at the 12 o'clock mark is a big date window, while a power reserve indicator resides at the 6 o'clock position. Time indication is facilitated by thermally blued hands crafted in the "Breguet Losange" shape; these hands possess a diamond cut finish and are curved, with the minute hand specifically bent by hand for optimal clearance and legibility. The watch is paired with a calfskin strap featuring alligator embossing, secured by either a traditional pin buckle or an optional folding clasp.

GenderMen

SignaturesChronoswiss

Country of OriginSwitzerland

Case Size40 mm

MovementAutomatic

CaliberC. 351

FunctionsHours, Minutes, Seconds, Big Date, Power Reserve

Power Reserve40 Hours

Case MaterialsRed Gold

Bezel MaterialsRed Gold

Lug MaterialsRed Gold

Case BackSapphire Crystal