Abstract: The technical problem of the invention concerns a seal device for guaranteeing to the addressee of containers that they have not been opened in transit.The technical problem is to provide such a seal device which is reliable and secure.The basis of the solution to this problem consists in the fact that the seal device comprises a body in the shape of a shank made from a metal cable (3) surrounded by a spring whose turns are close but not touching and which extends from the male ferrule (5) to the rear stop (4).The main usage of the invention resides in a seal device applicable to the doors of wagons, trucks, trailer containers and the like.