A bracelet clasp including a securing member provided with an adjustment device for adjusting the useful length of the bracelet, this adjustment device including a base plate secured to the second end of the first strip, a cap pivotally hinged to the base plate, the first strand passing between the base plate and the cap and being held by a holding device, second device for locking the cap in the closed position on the base plate. The second locking device include a push-piece arranged to be moved between a first rest position in which the cap is locked in a closed position on the base plate, and a second pushed-in position in which the cap is unlocked from the base plate.

An adjustable watch strap having a micro-adjustment system for providing micro adjustments to the circumferential length of the watch strap, in addition to existing standard adjustments. The micro adjustment system is integrated into a buckle (e.g., deployment buckle) and is configured to provide a plurality of microadjustments between standard adjustments or beyond a last or first standard adjustment.