The ornamental design for a necktie, as shown and described.
FIG. 1 is a perspective view showing the top and right side of the necktie showing our new design.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a rear elevational view thereof.
FIG. 4 is a right side view thereof.
FIG. 5 is a left side view thereof.
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a top view thereof.
The broken line showing of stitching details in FIG. 3 is included for the purpose of showing environmental portions of the Necktie and forms no part of the claimed design. The design is shown broken away in order to indicate that a specific length of necktie forms no part of the claimed design.