Monochrome Watches
An online magazine dedicated to fine watches
First Look

The New Brellum Duobox Triple Calendar Moophase LE Chronometer

Considering the reasonable cost, the COSC movement and attention to detail, this classic-looking chronograph with a calendar complication is an appealing proposition.

| By Denis Peshkov | 2 min read |

Established in 2016 by Sébastien Muller, a fourth-generation watchmaker, Brellum is an independent brand that employs a direct distribution model and offers exclusivity with only a few hundred pieces crafted each year, all COSC-certified chronometers. The Duobox, the brand’s inaugural collection, captured the hearts of enthusiasts with its timeless looks and competitive pricing, with several limited editions presented over the years and sold out in no time. Now, Brellum introduces the Duobox Triple Calendar Moonphase LE Chronometer, a timepiece that will resonate with long-time followers and newcomers alike. This limited release presents a rare opportunity for those who missed out before and comes with improved features.

The new Triple Calendar Moonphase LE Chronometer’s 100m water-resistant (up from 50m) stainless steel case is impeccably crafted, featuring alternating brushed and polished surfaces that lend it a refined aesthetic. With a diameter of 41.8mm, it strikes a good balance between presence and wearability. Thick box-style sapphire crystals with anti-reflective coating grace both the front and back of the watch, the latter facilitating observation of the movement. These substantial glass-box crystals inspire the collection’s name, Duobox, and contribute to the watch’s notable thickness, 15.9mm (the case without the crystals is 11.7mm thick). A large engraved and deeply knurled crown bears the Brellum insignia is positioned between the polished classic piston-style chronograph pushers.

Ad – Scroll to continue with article

The multi-level silvered dial of the Duobox Triple Calendar Moonphase LE Chronometer is adorned with a sunburst finish; its tasteful design features applied steel, three-dimensional Roman hour indices, with triangular markers at 12, 3, 6, and 9 o’clock. Encircling the perimeter, a date track borders a finely printed minutes/seconds track between the date track and the indices.

The date and month indications are housed within two small apertures positioned inside the 30-minute chronograph counter at 12 o’clock, while the moon phase display is integrated into the 12-hour chronograph counter at 6 o’clock. A subtle day-night indication graces the running seconds subdial at 9 o’clock. The hour and minute hands are accented with Super-LumiNova for enhanced legibility in low-light conditions. In contrast, the central chronograph hand and small hands of the subdials sport an elegant blue hue. The date is indicated by a slender, centrally mounted hand.

In line with its predecessors, the latest Brellum Duobox Triple Calendar Moonphase LE Chronometer runs on the automatic Calibre Brellum BR-751, derived from the ETA 7751 – the full-calendar iteration of the renowned ETA 7750. Operating at 28,800 vibrations/hour, the Calibre BR-75 offers a 46-hour power reserve, and its precision is COSC-certified.

The watch’s exhibition case back reveals movement decoration, featuring perlage, Geneva stripes, and blued screws; the openworked gold-plated rotor is engraved with the limited edition number. This limited to 46 pieces edition is presented with a handcrafted black alligator strap adorned closed with a deployant buckle; a stainless steel bracelet is also available upon request.

Priced at CHF 3,690, this latest iteration of the Duobox Triple Calendar Moonphase LE Chronometer is now available for orders. Deliveries are scheduled to commence in May. For further details, visit

Leave a Reply