The automatic calibre, the BRG 13501, equips the 1358 model and has been developed, constructed and produced in-house by Borgeaud. Its architecture is different and more compact since the specific complication of the Septagraph(tm) display is totally integrated into the movement rather than designed as an additional module.

The movement features a 53-hour power reserve and a date at 1 o’clock. In the tradition of Haute Horlogerie, all its component parts are hand-engraved, polished, and circular-grained or decorated with the Côtes de Genève pattern.

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