Adjustable bracelet clasp

A wristwatch including a bracelet provided with a clasp of the type having an unfolding buckle, comprising:

• a first upper strip and a second bottom strip hinged to each other via a first of the respective ends thereof, between a closed position for wear, and at least one open position, said second bottom strip having a face configured to come into contact with a wearer's wrist, said first upper strip carrying a fastening member to a first bracelet strand, said second bottom strip carrying a loop at the second end thereof defining a passage for a second bracelet strand and carrying a lug extending along a direction substantially perpendicular to said face configured to be inserted in a suitable hole in the bracelet strand to define a point of anchorage of said second bracelet strand to said second bottom strip of said clasp;
• and
• at least one locking member for holding said first upper strip and second bottom strip in the closed position thereof,
• wherein said loop has a plurality of sites, substantially aligned along the longitudinal direction of the bracelet, each of which is configured to cooperate with said lug to ensure the assembly thereof to said loop and to define a predefined position of the point of anchorage associated with a predefined usable length of the bracelet.