A method for manufacturing a master pattern for a mold for a horology component, comprising at least the following steps: - Manufacturing a first structure from a first photosensitive resin comprising at least one layer of photosensitive resin comprising a first pattern obtained by polymerizing the first photosensitive resin by irradiation through at least one mask, then developing said first photosensitive resin; - Transforming the first structure into a second structure by structuring at least one surface of the first structure by the addition of a second photosensitive resin to said at least one surface, this step consisting in transforming the first structure comprising the following steps: ∘ Applying a layer of the second photosensitive resin on at least part of the at least one surface of the first structure; ∘ Performing two-photon polymerization on the second photosensitive resin in order to obtain three-dimensional polymerization according to the second pattern, using a photon device which comprises an objective which is at least partially immersed in the second resin to direct and focus a beam on voxels that define the shape and/or the geometry of the second pattern; ∘ Developing in order to eliminate the non-polymerized second photosensitive resin and obtain the second structure of a form defined by the first and second patterns, wherein in said method the the second structure directly forms the master pattern of a mold for a horology component or forms a mold for the manufacture by molding of a master pattern of a mold for a horology component. - Manufacturing a first structure from a first photosensitive resin comprising at least one layer of photosensitive resin comprising a first pattern obtained by polymerizing the first photosensitive resin by irradiation through at least one mask, then developing said first photosensitive resin; - Transforming the first structure into a second structure by structuring at least one surface of the first structure by the addition of a second photosensitive resin to said at least one surface, this step consisting in transforming the first structure comprising the following steps: ∘ Applying a layer of the second photosensitive resin on at least part of the at least one surface of the first structure; ∘ Performing two-photon polymerization on the second photosensitive resin in order to obtain three-dimensional polymerization according to the second pattern, using a photon device which comprises an objective which is at least partially immersed in the second resin to direct and focus a beam on voxels that define the shape and/or the geometry of the second pattern; ∘ Developing in order to eliminate the non-polymerized second photosensitive resin and obtain the second structure of a form defined by the first and second patterns, wherein in said method the the second structure directly forms the master pattern of a mold for a horology component or forms a mold for the manufacture by molding of a master pattern of a mold for a horology component. ∘ Applying a layer of the second photosensitive resin on at least part of the at least one surface of the first structure; ∘ Performing two-photon polymerization on the second photosensitive resin in order to obtain three-dimensional polymerization according to the second pattern, using a photon device which comprises an objective which is at least partially immersed in the second resin to direct and focus a beam on voxels that define the shape and/or the geometry of the second pattern; ∘ Developing in order to eliminate the non-polymerized second photosensitive resin and obtain the second structure of a form defined by the first and second patterns, wherein in said method the the second structure directly forms the master pattern of a mold for a horology component or forms a mold for the manufacture by molding of a master pattern of a mold for a horology component.