The ornamental design for a wristwatch, as shown and described.
FIG. 1 is top and right perspective view of a wristwatch showing my new
design;
FIG. 2 is a top plan view thereof, the rear being flat and unornament.
The watchcase is illustrated as having the geometrical configuration of an
annular segment of a golf ball and a flat dial and flat backside. The
watchcase has a golf club mounted thereon.