The present disclosure includes a case body configured to accommodate a movement, and a rotating bezel attached to the case body. The rotating bezel includes a bezel body having an annular shape, and a display plate detachably attached to the bezel body. An engagement protrusion protruding toward the bezel body and being continuous in a circumferential direction is provided at the display plate. A plastic gasket having an annular shape is disposed between the bezel body and the engagement protrusion. A first recessed portion is provided in an outer circumference of the display plate. A second recessed portion is provided in the engagement protrusion of the display plate so as to correspond to a position of the first recessed portion.

The invention concerns a timepiece member including a first axis and a first threading intended to cooperate with 5 a second threading provided on a second timepiece member. The first threading is configured so that a zone of contact between the first threading and the second threading extends over less than 50% of the height of the threads of the second threading or is configured so that the zone of contact between the first 10 threading and the second threading extends over less than 0.3 times the pitch of the threading.

The invention concerns a timepiece member including a first axis and a first threading intended to cooperate with 5 a second threading provided on a second timepiece member. The first threading is configured so that a zone of contact between the first threading and the second threading extends over less than 50% of the height of the threads of the second threading or is configured so that the zone of contact between the first 10 threading and the second threading extends over less than 0.3 times the pitch of the threading.

A wristwatch includes an outer case that comprises an opening portion, a windshield glass disposed in the opening portion, a crown arranged at a side surface of the outer case, a bezel arranged around the windshield glass, a protective member fixed to a side surface at which the crown of the outer case is disposed, wherein the protective member has a notch portion that covers at least a portion of a side surface of the outer case and at least a portion of a side surface of the bezel and exposes the crown.

Disclosed is a decorative object including an upper glass, a lower glass, a recessed pattern formed in the lower glass and facing the upper glass, a liquid filling the recessed pattern, the refractive index of the liquid being equal to that of the lower glass or differing from that of the lower glass by at most 10 %, and solid elements which can move in the liquid.

A method for cutting watch crystals along a plurality of contours in a plate of transparent material includes forming a first cut line or kerf to form a first chamfer for each of the crystals of the plate and marking at least one machined recess on a first side of the plate, turning the plate over and marking at least one of the position of the first chamfer and the position of the at least one machined recess, forming a second cut line or kerf to form a second chamfer for each of the crystals on a second side of the plate, and separating the crystals by machining through the plate at each of the contours to form edges of the crystals.

A wristwatch includes an outer case that comprises an opening portion, a windshield glass disposed in the opening portion, a crown arranged at a side surface of the outer case, a bezel arranged around the windshield glass, a protective member fixed to a side surface at which the crown of the outer case is disposed, wherein the protective member has a notch portion that covers at least a portion of a side surface of the outer case and at least a portion of a side surface of the bezel and exposes the crown.

A skeleton watch includes a horological movement housed in a watch case, the horological movement being arranged to rotate at least one hand, the horological movement being covered by a dial, and the dial being disposed between the horological movement and the at least one hand. The dial includes a photochromic plate so that the horological movement is visible when the photochromic plate is exposed to an amount of UV radiation below a first threshold value and the horological movement is masked when the photochromic plate is exposed to an amount of UV radiation above a second threshold value.

The invention concerns an apparatus including a crystal or a screen in which the crystal or the screen is arranged to ensure sealing and an anti-scratch protection of said apparatus which is intended to display an information visible to a user through the crystal or the screen. The apparatus includes a first material layer (1) made of an unbreakable transparent plastic polymer fastened on the apparatus in a tight manner, and a second material layer (2) made of a transparent glass, superimposed on the first layer (1) and constituting the outer portion of the crystal or the screen of the apparatus. The second material layer (2) made of a transparent glass includes, carried by its inner face, a transparent repositionable glue film (4), this repositionable glue film (4) ensuring the repositionable adherence of the second material layer (2) on the first material layer (1), whereas the second material layer (2) with its repositionable glue film (4) can be removed so as to be able to be replaced by another second material layer (2) provided with a transparent repositionable glue film (4), without breaking the sealing of said apparatus ensured by the first material layer (1) which remains permanently fastened on said apparatus.

The invention concerns an apparatus including a crystal or a screen in which the crystal or the screen is arranged to ensure sealing and an anti-scratch protection of said apparatus which is intended to display an information visible to a user through the crystal or the screen. The apparatus includes a first material layer (1) made of an unbreakable transparent plastic polymer fastened on the apparatus in a tight manner, and a second material layer (2) made of a transparent glass, superimposed on the first layer (1) and constituting the outer portion of the crystal or the screen of the apparatus. The second material layer (2) made of a transparent glass includes, carried by its inner face, a transparent repositionable glue film (4), this repositionable glue film (4) ensuring the repositionable adherence of the second material layer (2) on the first material layer (1), whereas the second material layer (2) with its repositionable glue film (4) can be removed so as to be able to be replaced by another second material layer (2) provided with a transparent repositionable glue film (4), without breaking the sealing of said apparatus ensured by the first material layer (1) which remains permanently fastened on said apparatus.