Abstract: The folding clasp for an interchangeable watch strap comprises at least two arms articulated together and foldable against each other, provided with a fixing device to hold the clasp in closed position. The free end of one (1) of the arms (1, 3) is provided with a securement device for the end of a strap tongue (11) comprising a guide (8) having in cross-section a general U shape, an axle (9) connecting the two lateral wings of the guide (8) and holding members (10) adapted to coact with the upper surface of the tongue (11) of the strap. The free end of the other arm (3) of the clasp is pivoted on a cover (14) with the help of a screw (12), this cover (14) having lateral portions (13) interconnected by an axle (15). The cover (14) of the clasp comprises retaining members (16) adapted to coact with the upper surface of a second tongue (17) of the strap.

Abstract: The folding clasp for an interchangeable watch strap comprises at least two arms articulated together and foldable against each other, provided with a fixing device to hold the clasp in closed position. The free end of one (1) of the arms (1, 3) is provided with a securement device for the end of a strap tongue (11) comprising a guide (8) having in cross-section a general U shape, an axle (9) connecting the two lateral wings of the guide (8) and holding members (10) adapted to coact with the upper surface of the tongue (11) of the strap. The free end of the other arm (3) of the clasp is pivoted on a cover (14) with the help of a screw (12), this cover (14) having lateral portions (13) interconnected by an axle (15). The cover (14) of the clasp comprises retaining members (16) adapted to coact with the upper surface of a second tongue (17) of the strap.

Abstract: The device for securing a watch strap to a watch casing comprises an intermediate element (1) to which is fixed the end of the watch strap (3), this intermediate element (1) being adapted to be received between the lugs (4) of the watch casing (2) by sliding in a complementary formation (10, 5) on the lateral surfaces of the intermediate element (1) and the internal surfaces of the lugs (4). The intermediate element (1) comprises a flap (11) pivoted about an axis (12) transverse to the watch strap and subject to a resilient action (15). This flap comprises a locking nose (16) coacting in service position with a locking surface (8) on the end surface of the watch casing (2). This nose 16 is applied by said resilient action (15) against this locking surface (8) when the intermediate element (1) is in the service position introduced between the lugs (4) of the casing (2).

Abstract: The device for securing a watch strap to a watch casing comprises an intermediate element (1) to which is fixed the end of the watch strap (3), this intermediate element (1) being adapted to be received between the lugs (4) of the watch casing (2) by sliding in a complementary formation (10, 5) on the lateral surfaces of the intermediate element (1) and the internal surfaces of the lugs (4). The intermediate element (1) comprises a flap (11) pivoted about an axis (12) transverse to the watch strap and subject to a resilient action (15). This flap comprises a locking nose (16) coacting in service position with a locking surface (8) on the end surface of the watch casing (2). This nose 16 is applied by said resilient action (15) against this locking surface (8) when the intermediate element (1) is in the service position introduced between the lugs (4) of the casing (2).

Abstract: The movable shutter device provided on a timepiece comprises stretchers in the form of oblong handles which are screwed onto a middle part of generally rectangular shape with flanks. The stretchers comprise a groove which is composed of a rectilinear portion followed on either side by a rounded portion, the latter giving on a groove which is formed by the surfaces of a protective plate connected to the back cover and by a flat portion of said back cover. The closed circuits formed by the grooves surround the middle part. The movable curtain formed by shutter axles which are interconnected on both sides by two rows of connecting links is slidable in said grooves by means of rollers made of rubies. In order to ensure that any intermediate position of the curtain between the two end positions is maintained, i.e.