Brellum Duobox Classic Power Reserve LE.1 Watch Brellum by wholesalewatches - June 14, 20170 Brellum, an independent Swiss watch brand launched only in December 2016, has already begun adding to their debut Duobox collection with two new models. They are a two-tone steel and rose gold version of their original Duobox chronograph and, the subject of this article, the Brellum Duobox Classic Power Reserve