The ornamental design for a collectiblechip, as shown and described.
FIG. 1 is a front perspective view of the collectible chip showing the new design;
FIG. 2 is a top view thereof; the bottom view being a mirror image thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a left side elevational view thereof; the right side elevational view being a mirror image thereof; and,
FIG. 6 is an environmental perspective view of the collectible chip in a display device; the display device being shown in broken lines and forming no part of the claimed invention.