A tamper evident security seal includes a locking unit (109 and a bolt with a groove at its shank locking portion, the groove for receiving a resilient locking ring attached to a lock body in a locking unit receiving the bolt in a locked state. The locking unit includes two housing portions (12,14) one of which has a top wall (18), a bottom wall (16)and a first upstanding segment of a circular cylinder side wall (20) interconnected thereto may be of any color. The top wall (18) has an aperture (28) for receiving the bolt therethrough. A mating second housing portion has a second segment of a circular cylinder side wall (32), preferably white having ID indicia thereon, forms a circular cylindrical housing with the first housing portion and is captured between the top and bottom walls. A lock body first element is plastic and molded one piece with the second housing portion. A lock body second steel element mates with the first element forming a lock body with an annular channel in which the ring is positioned. The channel and ring generally form a conventional bolt locking arrangement. A plastic transparent cover, enclosing the two housing portions (12.14), is bonded to the bottom wall (16). A collar on the top wall has two slots for receiving mating anti-spin tabs on the bolt shank.
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