BRELLUM Swiss Watchmaking is an independent Swiss brand developing, producing and marketing high quality timepieces for admirers of exceptional craftsmanship. The cradle for Jura watchmaking and ancestral know-how is located at Porrentruy which is a medieval city built in 1148. So I am proud to represent the 4th generation of Muller family watchmakers who have been succeeding one another in this craft since 1885. I now feel that at the ripe old age of 42, a return to my craft-industry watchmaking roots is now an obvious evolution after studying for a watchmaking apprenticeship and with more than 25 years entirely dedicated to the acquisition of diverse skills in posts such as Product manager, Quality control manager and Production manager in world famous watchmaking companies as well as having developed hundreds of models and having produced several million Swiss watches.

BRELLUM Swiss Watchmaking was born out of a desire to offer a demanding clientele my vision of what Swiss watchmaking should look like not only for today but also in the future. Products with timeless and durable lines, manufactured using high quality materials with reliable automatic mechanical movements, fully adorned and officially certified by the Officiel Suisse des Chronomètres (COSC).

Only 299 Duobox Chronometer watches are produced each year. Its timeless design is characterized by its concave sapphire glass, its slightly convex dial surmounted with diamante appliques and its perfectly dimensioned hands.
The Duobox collection is so named with reference to its two concave sapphire watch faces which were formerly produced in plastic. The first one protects the dial allowing for optimal viewing due to the anti-flare treatment that has been undertaken in the manufacturing process. The second one covers the back of the timepiece and allows for the automatic movement of the watch to be admired in detail and at all times. The contact of sapphire with the skin offers the wearer optimal comfort.

The automatic movement, indeed the heart that beats inside the Duobox Chronometer, is the Valjoux 7750. This was developed in the 70s thus being recognized for its qualities concerning precision and robustness and has since been elevated to the rank of a Swiss watchmaking icon. Carefully decorated, it is surmounted by BRELLUM’s oscillating mass which has also been treated with the same level of delicacy. As a guarantee of absolute precision, the movement is officially “certified chronometer” by the COSC which is an independent body that issues an individual chronometer certificate with each BRELLUM watch.

Swiss Made and COSC certification As a guarantee of quality and respectability, all BRELLUM watches proudly display the Swiss Made designation. This distinction is reserved for brands that comply with the requirements of Swiss federal legislation. In addition to the Swiss Made label, each movement of a BRELLUM watch also adopts the “Certified Chronometer” certification standards (COSC). This label is only reserved for the movements of watches which successfully pass a constraining group of tests which determine the precision and stability of each movement. Validation is carried out by an independent body known as the Contrôle Officiel Suisse de Chronométrie (COSC). Each BRELLUM watch comes with its own individual certificate of chronometry where each measurement result is recorded. Only 6% of the total Swiss watch production, as is the case with BRELLUM watches, has the designation «chronometer officially certified» inscribed on the dial.

Designing a fine Chronograph is not an easy task. Perfection is in the details and Brellum did a superb job with its Duobox. Priced at 2,250 US$, it represents stunning value for money and it is indeed a worthy pick if you feel you do not need a famous brand name to impress your friends. One of the reasons that Brellum is able to offer such affordable prices is because Sébastien Muller sells his watches directly to clients (no distributor, no retailers or other middlemen). Brellum plans to manufacture a maximum of 299 watches a year. For more information visit

Technical specifications – Brellum Duobox

  • Case: Stainless steel 316 L, 1.4435, 41.80mm x 16.20mm – 316L steel – box sapphire crystal, box sapphire caseback with antireflective coating – water resistant to 50m
  • Movement: BR750-1 calibre (Valjoux 7750) Chronometer certified by COSC – mechanical with automatic winding – 46h power reserve – 28,800 vibrations/h – 25 jewels – hours, minutes, seconds, chronograph, date.
  • Bracelet: Milanese steel bracelet with safety folding buckle or calf leather strap
  • Price : from 2,250 US$, excl. taxes, free shipping