Abstract: A timepiece assembly including a first component and a second component assembled under stress, wherein at least one part of the surface of the assembly is coated with a protective layer intended to cover defects such as cracks or incipient cracks after assembly. It also relates to the method for manufacturing this assembly.

Abstract: A gold alloy including, by weight, between 73% and 77% gold, between 20% and 24.5% silver, palladium and/or platinum with a total percentage for these two elements between 0.5% and 5%. With the addition of palladium and/or platinum, this alloy has an enhanced tarnishing resistance while having a green tint.

Abstract: A platinum alloy consisting, by weight, of the following elements: 95.00 to 96.00% of Pt, 1.00 to 4.95% of Ru, 0.05 to 2.00% of Ge, 0 to 2.00% of Au, any impurities with a total content 0.50%.

Abstract: A platinum alloy consisting, by weight, of the following elements: 95.00 to 96.00% of Pt, 1.00 to 4.95% of Ru, 0.05 to 2.00% of Ge, 0 to 2.00% of Au, any impurities with a total content?0.50%.

Abstract: A mainspring includes a spiral metal strip and a hooking area formed in an inner face of an inner end of the strip, the hooking area including at least one shaped portion and at least one cavity in the inner face of the inner end.

Abstract: A timepiece mainspring including, in the manufactured state, an eye and a portion formed of coils with an outer coil of radius R, the eye and the portion formed of coils being connected by a neck portion having substantially zero curvature, the timepiece mainspring wherein the neck portion has a length LC comprised between 1.5 and 10 times, and preferably between 2 and 8 times, the radius R. The mainspring having this specific geometry reduces the risk of premature breakage during use, typically for an application with a k factor lower than 10.

Abstract: A timepiece assembly including a first component and a second component assembled under stress, wherein at least one part of the surface of the assembly is coated with a protective layer intended to cover defects such as cracks or incipient cracks after assembly. It also relates to the method for manufacturing this assembly.

Abstract: A timepiece mainspring including, in the manufactured state, an eye and a portion formed of coils with an outer coil of radius R, the eye and the portion formed of coils being connected by a neck portion having substantially zero curvature, the timepiece mainspring wherein the neck portion has a length LC comprised between 1.5 and 10 times, and preferably between 2 and 8 times, the radius R. The mainspring having this specific geometry reduces the risk of premature breakage during use, typically for an application with a k factor lower than 10.

Abstract: Method for press-rolling a mainspring, from a wire comprising a pre-formed eye, utilizing a roller press comprising a first support and guide means exerting a force on the wire in a first contact area located between a second and a third contact area comprised in a second and a third support and guide means, in order to wind, beyond the eye, an accumulation area with an opposite curvature to that of the eye, and wherein, as the wire advances, the position of the first contact area is gradually moved away from the second and third contact areas, to vary the press-rolling radius from a first minimum value to a second maximum value at a neck junction between the accumulation area and the eye.

Abstract: A mainspring including a spiral metal strip and a hooking area formed in an inner face of an inner end of the strip, the hooking area including at least one shaped portion and/or at least one cavity comprised in the inner face of the inner end.

Abstract: Method for press-rolling a mainspring, from a wire comprising a pre-formed eye, utilising a roller press comprising a first support and guide means exerting a force on the wire in a first contact area located between a second and a third contact area comprised in a second and a third support and guide means, in order to wind, beyond the eye, an accumulation area with an opposite curvature to that of the eye, and wherein, as the wire advances, the position of the first contact area is gradually moved away from the second and third contact areas, to vary the press-rolling radius from a first minimum value to a second maximum value at a neck junction between the accumulation area and the eye.