Abstract: Metal case part (9) having a wall whose outer surface (11) includes separated knobs (23a, 23b, 23c) formed by a synthetic material, characterized in that one face (12) opposite to the outer surface (11) of the part (9) includes a groove (15) connected to said outer surface (11) by through passages (13a, 13b, 13c) at locations provided for the knobs (23a, 23b, 23c) and in that said knobs (23a, 23b, 23c) originate from a filler (20) made of synthetic material projecting from the outer surface (11), while being connected to each other through said through passages (13a, 13b, 13c) to a strand 25, also made of synthetic material, held on the bottom of the groove (15).

Abstract: A system for attaching a wristlet to a watch case (15) comprises at least one pin (45), which is situated in a cylindrical housing (45A) of a flexible resilient film (30), made of a plastic material or rubber, and at least one link (25) for attaching the wristlet to the watch case.The connection between the watch case and the wristlet is achieved as a result of the presence of the film (30) which is inserted in openings, provided within the attaching link (25) and the other links of the wristlet.The cylindrical housing (45A) comprises a series of hollow extensions (48), communicating with said housing, so that the coupling of a plastic element, such as the film (30), with the attaching link (25) made of metal has the effect of increasing the traction resistance of the wristlet with respect to the prior art.