Abstract: There is disclosed an apparatus for marking closure clips (22) having a clip base (24) and clip legs (26, 28) adjoining the same on both sides, comprising a rod (20) for guiding the closure clips, an embossing stamp (50) movable relative to the rod for embossing the mark onto the closure clips supported by the rod, and comprising a flap-type crimping element having at least one crimping flap (12) for producing a packaging casing neck free from filling in a tubular or bag-shaped package to be closed with a closure clip (22). It is provided that the crimping flap (12) carries and drives the embossing stamp (50), and the embossing stamp is fixed at the crimping flap such that it marks a closure clip (22) when the crimping flap carrying the stamp is closed for producing the neck free from filling.