Brellum

Brellum is a Swiss watch brand associated with watchmaker Sébastien Muller in Porrentruy. Direct sales from its workshop to customers are a central part of its stated business approach. Its family history mentions a great-grandfather's workshop dating to 1910. That date must not be used as the founding year of the Brellum brand.

Model names include Duobox, Pandial and Wyvern. The manufacturer's manuals cover different calibres, including BR-750-1 and BR-893 GMT. Identify the correct model and movement before describing functions or operation.

Brellum discusses COSC certification of its mechanical movements. A testing certificate does not guarantee the present timekeeping of a second-hand example after years of use. Check documentation, reference, service history and actual operation. Do not transfer case dimensions, water resistance, power reserve or a particular movement base from one model to the entire brand. Chronometer certification and a chronograph timing function are also distinct concepts.

Sources: Brellum: egen historie; Brellum: kaliberspesifikke bruksanvisninger; Brellum: COSC-sertifisering.