The ornamental design of a watch, as shown and described.
FIG. 1 is a front elevational view of a watch showing my new design illustrating an open position of a rotatably movable ribbon element to permit viewing of the watch dial;
FIG. 2 is a back elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a front, right side perspective view thereof; and,
FIG. 8 is a right, front perspective view of the watch illustrating an alternate, closed position of the rotatably movable ribbon element to cover the watch dial.