The ornamental design for watch, as shown and described.
FIG. 1 is a front and left side perspective view of a watch showing our new design;
FIG. 2 is a front elevation thereof;
FIG. 3 is a bottom plan view of the watch, the top plan view is the same;
FIG. 4 is a bottom and right side view taken from a position that is rotated 45 degrees clockwise from the position in FIG. 3;
FIG. 5 is a right side view of the watch, the left side view is the same; and,
FIG. 6 is a bottom and left side view taken from a position that is rotated 45 degrees counter-clockwise from the position in FIG. 3.
The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. The views in the drawings are shown on different scales.