Wristlet clasp with unfolding buckle

A wristlet clasp for connecting the ends of a wristlet, said clasp comprising an elongate curved central portion comprising two plates adjustable lengthwise relative to one another to vary the length of said central portion between maximum and minimum lengths, means for securing said two plates to one another in selected lengthwise position relative to one another, two curved arms hingedly connected to opposite ends respectively of said central portion, said arms having a combined length less than the minimum length of said central portion and being swingable between an open position in which they extend beyond the ends of said central portion and a closed position in which they overlie the outer convex side of said central position, said arms have side webs engageable with side edges of said central portion with a snap engagement to retain said arms releasably in closed position, pivot means hingedly connecting ends of said wristlet with free ends of said arms respectively, and a cover plate hingedly connected with the free end of one of said arms for movement betwen an open position and a closed position in which it overlies and thereby covers a gap between the free ends of said arms when in closed position, said cover plate having a length sufficient to cover said gap when said central portion is of maximum length, and having side webs engageable with the hinge connection at the free end of the other arm with a snap engagement to retain said cover plate releasably in closed position.