We claim the ornamental design for a key chain charm holder, as shown and described.
FIG. 1 is a perspective view of a key chain charm holder, showing our new design, illustrated in an open position;
FIG. 2 is a perspective view thereof, illustrated in a closed position;
FIG. 3 is a front elevational view thereof, illustrated in the closed position;
FIG. 4 is a rear elevational view thereof, illustrated in the closed position;
FIG. 5 is a left-side elevational view thereof, illustrated in the closed position, the right-side elevational view being a mirror image thereof;
FIG. 6 is a top plan view thereof, illustrated in the closed position; and,
FIG. 7 is a bottom plan view thereof, illustrated in the closed position.
The broken lines showing a key chain and charms in FIG. 1 are included for the purpose of illustrating the invention in use, and form no part of the claimed design.