The ornamental design for a securitytag, as shown.
FIG. 1 is a top perspective view of the security tag of the present invention;
FIG. 2 is a top view of the security tag of FIG. 1;
FIG. 3 is a bottom view of the security tag of FIG. 1 as seen from a bottom side of FIG. 2;
FIG. 4 is a side view of the security tag of FIG. 1, as seen from the top and bottom sides of FIG. 2; and,
FIG. 5 is a side view of the security tag of FIG. 1, as seen from the left and right sides of FIG. 2.
The broken line showing of a pin element on the bottom of the design is included for the purpose of illustrating portions of the “article” and forms no part of the claimed design.