I claim the ornamental design for an antler display device with a tree bark motif, as shown and described herein.
FIG. 1 is a left front perspective view of an antler display device with a tree bark motif.
FIG. 2 is a top view thereof.
FIG. 3 is a bottom view thereof.
FIG. 4 is a front view thereof.
FIG. 5 is a rear view thereof.
FIG. 6 is a left-side view thereof.
FIG. 7 is a right-side view thereof; and,
FIG. 8 is a front view thereof. The dotted line portion showing a pair of antlers is for illustrative purposes only and form no part of the claimed design.