The ornamental design for a shellcasingjewelry mount array with subplate, as shown and described.
FIG. 1 is a top perspective view of the shell casing jewelry mount array with subplate of the instant invention illustrated secured to a bracelet;
FIG. 2 is a front view, the rear view being a mirror image thereof;
FIG. 3 bottom view thereof;
FIG. 4 is a top view thereof; and,
FIG. 5 is a left side view, the right side view being a mirror image thereof.
The portions of the figures illustrated in broken lines illustrate portions of the shell casing jewelry mount array with subplate design that are not claimed.