Abstract: A closed seal member has a channel extending through it and contains a holder with locking members for the irreversible holding of an end of a flexible band of metal, which end is introduced into the channel. The other end of the band is fastened in the seal member. The flexible band carries a detachable code carrier. Both the seal member and also the code carrier fastened on the band have a code which is identical for both or is a unique code. The code carrier is fastened in such an area of the band that the seal can be closed only after removal of the code carrier.