The ornamental design for a wristwatch, as shown and described.
FIG. 1 is a front-left perspective view of a first embodiment of a wristwatch showing my new design;
FIG. 2 is a left-rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a left side elevational view thereof, wherein the wristwatch latch mechanism is illustrated in a closed position, an elevational view of the right side being a mirror image thereof;
FIG. 8 is a left side elevational view thereof, wherein the wristwatch latch mechanism is illustrated in a partially open position, an elevational view of the right side being a mirror image thereof; and,
FIG. 9 is an enlarged partial front view of a second embodiment thereof, wherein the diamonds covering the surface shown in broken lines and the wristwatch surface underlying the diamonds form no part of the claimed design. The second embodiment is the same in all other respects.
The broken line portions of the drawing figures are included to show unclaimed subject matter only and form no part of the claimed design.