Abstract: The invention relates to a pen including a tubular body and a rigid fastening clip that extends longitudinally of the body and is pivotably movable with respect to the body, characterized in that the clip (6) is solidly attached in its upper portion (7) to at least one point of an elastic device (8, 9) accommodated in the body (1, 2) and immobilized with respect to it in the longitudinal and transverse directions.

Abstract: A device for fastening a strap to a buckle, in particular a leather strap to a self-extending buckle of a wristwatch comprises spindle around which a band making up the strap is coiled, and a support holding a first part of the band in place coiled around the spindle. In addition, the device includes two posiitoning devices of one piece with the support, located one on each side of the band and whose ends, separated one from the other by a distance smaller than the width of the band, are located at a sufficient distance from the spindle toward the strap so that the edges of the second part of the band coiled around the spindle and located on the side opposite to the first part bearing on the support, may, by twisting the band along lines parallel to its length, be inserted underneath the positioning devices in order to determine the useful length of the strap.