Closing device (1) for an anti-theft case (100), said closure (1) being equipped with a closing / opening adapted to be driven by a separating device or decoupling device, said device also being equipped closure (1) with means for fastening to said anti-theft case (100) so that said closure device (1) is adapted to be applied or removed from said anti-theft case (100) only when said anti-theft case (100) is opened , wherein the closure device (1) comprises an outer body (3) within which slides longitudinally a slider lock (5) along a closing direction (VC) and an opening direction (VA) to go to a position and a respective closing position respectively opening, said outer body (3) being equipped with at least one circumferential groove (7) adapted to allow a locking tooth (109) of the housing antitheft (100) is inserted from the outside through said circumferential groove (7) in at least one locking cavity (9) within said outer body (3), said locking cavity (9) defined by being at least one locking tooth (11) integral with said locking slider (5) and corresponding to a respective groove (7) so that when said locking slider (5) is in said closed position, said locking tooth ( 11) is positioned between said locking cavity (9) and said groove (7) respectively, and, when said locking slider (5) is in said open position, said locking tooth (11) releases a passage between said cavity lock (9) and said groove (7) respectively.
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