The ornamental design for a watchcase, as shown and described.
FIG. 1 is a top view of the watch case of the present invention.
FIG. 2 is a bottom view of the watch case of FIG. 1.
FIG. 3 is a right side view of the watch case of FIG. 1.
FIG. 4 is a left side view of the watch case of FIG. 1.
FIG. 5 is a front view of the watch case of FIG. 1.
FIG. 6 is a back view of the watch case of FIG. 1; and,
FIG. 7 is a top, right-side perspective view of the watch case of FIG. 1.
The broken lines showing in FIG. 2 are for the purpose of illustrating the bottom of the watch case of the present invention, and form no part of the claimed design.