System for producing at least one three-dimensional element on an external part element of a timepiece

A process for producing at least one three-dimensional element on a visible face of an external part element of a timepiece, said process comprising:

• designing a support plate comprising the external part element including a sub-step of creating at least one through opening in a thickness of the external part element, said at least one through opening comprising a variable cross-section along a revolution axis thereof interconnecting centers of entry and exit orifices of said at least one through opening with each other;
• arranging the support plate comprising the external part element in a mold formed by reversible assembly of first and second parts, said arranging comprising a sub-step of forming at least one cavity in said mold by associating the first part including at least one impression with the visible face of the external part element;
• constructing a blank of each three-dimensional element on the visible face of the external part element, said constructing comprising a sub-step of over-molding by injecting an injectable material into the cavity via the at least one through opening arranged in said external part element at an injection point provided at the entry orifice of said at least one through opening;
• and
• finalizing the blank of the three-dimensional element comprising a sub-step of applying a coating on said blank over-molded on the external part element after carrying out one of the following sub-steps of said finalizing:
• a sub-step of disassembling the first part from the second part of the mold, or
• a sub-step of removing said mold from the support plate comprising the external part element provided with the blank of the three-dimensional element over-molded on the visible face thereof.