FIG. 1 is a top right perspective view of an ornamental design for a wristwatch showing my new design;
FIG. 2 is a top left perspective view thereof;
FIG. 3 is a bottom left perspective view thereof
FIG. 4 is a bottom right perspective view thereof;
FIG. 5 is a front view thereof, the rear view being a mirror image;
FIG. 6 is a top view thereof; and,
FIG. 7 is a right side view thereof, the left side view being a mirror image.