Method for fabrication of a timepiece provided with a multi-level exterior element

A method for fabrication of a piece provided with an exterior element, comprising:

• superposing an electrically insulating layer including a first through orifice, an additional layer including a first through aperture, an intermediate layer including a first through hole, and a base layer surmounted by a base motif, so as to place the base motif inside the first through hole, cover the first through hole with the first through aperture, and superpose the first through aperture and the first through orifice;
• forming an electrically conductive surface on one portion of an upper face of the insulating layer located at the periphery of the first through orifice;
• electrodepositing a metal or metal alloy layer, so that at the end of the electrodepositing, the metal or metal alloy layer forms a shell covering walls of the base motif, of the first through orifice, of the first through aperture and of the first through hole, and comprises a lateral area resting on the electrically conductive surface of the insulating layer;
• dissolving the insulating layer;
• after the dissolving the insulating layer, coating the metal or metal alloy layer with a volume at least partly formed by a base material of the piece, so that an upper end of the metal or metal alloy layer is embedded within the volume;
• and
• after the coating, removing the volume and the metal or metal alloy layer together from the additional layer, the intermediate layer, and the base layer such that the volume forms the piece and the metal or metal alloy layer forms the exterior element protruding from an upper surface of the piece.