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This chronometer pays tribute to the Count of La Pérouse's expedition and the five FERDINAND BERTHOUD Marine Chronometers he took with him on board two frigates – L’Astrolabe and La Boussole – in 1785. The bronze used for the cases of the five models in the limited series is a nod to the passing of time and to brass, a material that Ferdinand Berthoud used in the 18th century for his Maritime Chronometers. 
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Inspired by Ferdinand Berthoud's Marine Chronometer No. 7, the displays appear on a mostly solid dial, in fact the rear face of the regulator plate. Three openings catch the eye: dragging hours on a sapphire disc at 2 o'clock: a new power-reserve mechanism at 10 o'clock; and minutes at 12 o'clock. The seconds are indicated by a central hand. 
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Chronométrie FERDINAND BERTHOUD perpetuates the art of hand-decorating each component of every movement, using traditional tools. The satin-brushed of the "straight-grained" dials, composed of rigorously parallel micro-scratches, the 45-degree bevelling of the edges of very small parts, as well as the mirror polish, all serve to capture light while playing with contrasts. 
