Bracelet clasp comprising a device for adjusting the usable length of the bracelet

The wristwatch comprising a band fitted with a clasp of the type comprising first and second free ends, wherein the clasp comprises

• first and second fastening members of the bracelet intended to be made respectively integral to the first and second free ends of the bracelet, wherein said fastening members are movable in relation to one another between at least one open position and a closed wearing position, in which they are closer to one another than in the open position, to close the bracelet and determine a usable length for it,
• at least one locking member arranged to hold said fastening members of the bracelet in their closed position,
• at least one control member for said locking member arranged to unlock the clasp in response to an action of a user and to move from said closed position to said open position,
• a device for adjusting the usable length of the bracelet comprising
• an adjusting member, which bears said first fastening member of the bracelet and
• at least one lock capable of having a default closed state, in which said adjusting member is fixed, and an open state, in which said adjusting member is free to slide in the direction of the length of the bracelet with respect to said second fastening member of the bracelet to modify the usable length of the bracelet,
• wherein said adjusting device is separate from said locking member, and that said lock is arranged to move from its closed state to its open state by the user acting on said control member of the locking member such that said adjusting member is capable of being shifted independently of the open or closed state of the clasp.