Elevating raw brass and steel into artifacts that capture light.
Geneva Stripes (Côtes de Genève) are undulating linear abrasions applied to the top plates, historically meant to catch dust that might otherwise settle into the gear train. Beneath the balance wheel, Perlage—tightly overlapping circular graining—serves a similar aesthetic and practical function.
Perhaps the most labor-intensive finish, anglage requires filing the 90-degree edges of a bridge to an exact 45-degree angle, followed by meticulous polishing using diamond paste and pegwood. A master finisher spends days perfecting a single component.
Applied to flat steel components like tourbillon bridges, black polishing involves rubbing the part on a tin plate covered in microscopic diamond dust. The resulting surface is so perfectly flat that it reflects light only in one specific direction; from any other angle, it appears pitch black.
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