Abstract: Device for fastening a bracelet strand to a case of a watch. The device includes at least one fastening element allowing this bracelet strand to be detached from this case when this fastening element is subjected to a predetermined force or moment. Wristwatch including a case and at least one bracelet strand pivotally hinged about a shoulder of a pin forming such a device. This pin is a sacrificial pin which includes, on this shoulder, at least one area of mechanical resistance lower than the lowest mechanical resistance of this case and than the lowest mechanical resistance of this bracelet strand.

Abstract: The electronic timepiece movement (2) is equipped with a motor (4) including a stator and a permanent magnet rotor (6) situated in a stator hole, said stator defining at least two magnetic poles (12, 14) respectively including at least two pole shoes (16, 18) extending at the periphery of the hole. The motor includes at least one coil (28) respectively mounted around at least one core (26). The two pole shoes and the core form together a first part made of ferromagnetic material formed by or including a single-piece wafer forming both the two pole shoes and the core. An end portion of the core is connected to at least one corresponding pole shoe by a second part, defining a base plate or a main plate made of magnetic material, to which the first part is secured and on which elements of the electronic timepiece movement are at least partially mounted.

Abstract: The sub-assembly includes, irreversibly fixed to a main plate and each irreversibly pre-adjusted by the irreversible securing of adjustment and/or assembly components, after the particular timepiece function thereof has been adjusted and function checked on the test bench, functional modules: a gear train module, a display module, and a time-setting module. Other mechanical sub-assemblies, each irreversibly fixed to the preceding lower order mechanical sub-assembly, include various modules; motor module frame-mounted self-winding device module escapement holder regulating module motion work train date module self-winding module. Mechanical movement including at least one mechanical sub-assembly of this type. Watch including a mechanical movement of this type. Method of assembling mechanical sub-assemblies of this type by the irreversible securing of mechanical sub-assemblies and irreversibly pre-adjusted modules.

Abstract: Shockproof timepiece wheel for driving a component having non-zero unbalance relative to a pivot axis of this wheel, this wheel includes, on the one hand, an arbour for pivotally guiding the wheel about this pivot axis, and on the other hand, a drive means arranged or assembled on a flange of this wheel, this wheel including at least one flexible element between this arbour and this flange. This flange includes a cylindrical shoulder cooperating in abutment for centring purposes with a complementary cylindrical shoulder comprised in this arbour to ensure the perfect concentricity of this drive means (7) with this arbour.

Abstract: The timepiece includes first (1) and second (2) rings to which indications (3, 4) are affixed for displaying, in combination with each other, a time-related magnitude (5), which appears in a large aperture (6). The rings (1, 2) have equal dimensions, are arranged one on top of the other and off-center in relation to each other such that, at the vertical of the large aperture, the outer edge (7) of the first ring (1) substantially borders the inner edge (8) of the second ring (2).

Abstract: The timepiece includes first (1) and second (2) rings to which indications (3, 4) are affixed for displaying, in combination with each other, a time-related magnitude (5), which appears in a large aperture (6). The rings (1, 2) have equal dimensions, are arranged one on top of the other and off-centre in relation to each other such that, at the vertical of the large aperture, the outer edge (7) of the first ring (1) substantially borders the inner edge (8) of the second ring (2).