The ornamental design for a watchdial, as shown and described.
FIG. 1 is a top view of the watch dial of the present invention.
FIG. 2 is a bottom view of the watch dial of FIG. 1.
FIG. 3 is a right side view of the watch dial of FIG. 1, the left side view being a mirror image thereof; and,
FIG. 4 is a top, right-side perspective view of the watch dial of FIG. 1.
The structural elements depicted by broken lines in FIGS. 1, 2, and 4 have been shown for the purpose of illustrating portions of the claimed watch dial that form no part of the claimed design.