Abstract: The portion of the rim (1) situated between the flanges (2) presents a clearance (3) in the form of an arc of a circle provided between the lateral exterior side and concentric with the center of the case. Another clearance (4), also in the form of an arc of a circle, is provided in the surface of the rim (1) adjacent to the crystal (5) and extends at an angle from the first clearance (3) and on both sides thereof. The edge of the second clearance (4) is located at a distance from the outside edge of the rim (1), thus providing two retaining eyes (4a). The clearances (3, 4) receive a decorative element (6), the upper side of which is adjacent to the lower side of the crystal (5), which prevents it from falling out through the clearance (4).

Abstract: A tool for tightening and untightening screw-type bottoms or backs of watch casings in which the spindle by which the bottom is rotated is threaded to a tool stand using the same pitch of thread as that of the threads on the watchcase bottom, so that as the spindle is rotated it is displaced axially by the same amount as the bottom, thereby keeping the tool on the spindle in proper engagement with the bottom of the case.