I claim the ornamental design for a label holder, as shown and described.
FIG. 1 is a front perspective view of the claimed design:
FIG. 2 is a first side back perspective view of the claimed design of FIG. 1;
FIG. 3 is a second side back perspective view opposite the first side of the claimed design of FIG. 1;
FIG. 4 is a back view of the claimed design of FIG. 1;
FIG. 5 is a front view of the claimed design of FIG. 1;
FIG. 6 is a side view of the claimed design of FIG. 1;
FIG. 7 is a side view of the claimed design of FIG. 1 showing the side opposite that shown in FIG. 6;
FIG. 8 is a top view of the claimed design of FIG. 1; and,
FIG. 9 is a bottom view of the claimed design of FIG. 1.
The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. The dot-dash lines in the drawings form a boundary of the claimed design and form no part thereof.